Washington (CNN) -- Another African milestone, another African tragedy.
In 1994, a stunning array of world leaders gathered in South Africa to celebrate Nelson Mandela's inauguration while genocidal massacres spread in Rwanda.
Now, the world focuses on South Africa again -- this time for Mandela's funeral -- as warnings of potential genocide emanate from Central African Republic.
The ironic juxtaposition of the greatest example of African reconciliation with horrific carnage elsewhere on the continent raises the question of what has changed in the 19 years since Rwanda to prevent the kind of targeted exterminations the world repeatedly vows to stop from happening again.
If the situation in Central African Republic is the guide, the answer is some change has occurred, but probably not enough.
Conflict in Central African Republic
On Friday, the U.N. high commissioner for refugees reported more than 600 deaths and 159,000 people displaced in the impoverished landlocked nation because of sectarian violence involving Muslim and Christian militias.
According to the report, the situation in Bangui, the capital, continued to deteriorate despite the presence of French and African Union forces sent to restore order and disarm the rival militia groups. Tens of thousands of refugees have fled to neighboring countries or gathered at the Bangui airport, which is being secured by foreign troops, it said.
The aid group Medecins Sans Frontieres slammed the United Nations this week for what it called an unacceptable humanitarian response, echoing similar frustration and despair heard from witnesses to looming crises in Rwanda and elsewhere in recent decades.
At the same time, the ongoing arrival of up to 1,200 French troops and 6,000 African Union forces drawn from several countries reflects a shift since Rwanda that put more responsibility for regional peacekeeping on Africans while demonstrating a willingness to act -- even if in a limited way -- in the face of atrocities.
To Gregory Stanton, a genocide expert at George Mason University in Virginia, the international response so far is lacking in a conflict that he believes "is genocidal already."
Stanton, who heads the nonprofit group Genocide Watch, said genocide occurs any time there are massacres targeting victims based on race, ethnicity, religion or nationality.
"If you have mass killings, whether it's based on religion or politics or whatever, we think that's bad enough," he said. "You've got to take action to stop it."
Rwanda symbolizes global failure
The Rwanda genocide, in which hundreds of thousands of people died over three months of ethnic attacks, remains the symbol for ineffective international response to African carnage.
U.N. peacekeepers scaled back as the organized Hutu slaughter of Tutsis escalated, and the world body and Western powers, including the United States, were blamed for failing to intervene more forcefully.
"The genocide in Rwanda has caused an enormous amount of soul-searching, particularly in the West," noted John Campbell, a senior fellow at the Council on Foreign Relations and former U.S. ambassador to Nigeria.
Now, he said, there remains "a sense that this absolutely should not have happened," as well as frustration in Washington and other capitals "over what in fact could have been done or should have been done."
Stanton described deep rifts in the Clinton administration at the time between officials favoring or opposing stronger intervention.
In particular, he cited a telephone screaming match between then U.N. Ambassador Madeleine Albright and National Security Council official Richard Clarke over orders for Albright to vote for withdrawal of U.N. peacekeepers in the face of the suddenly escalating violence.
"I just wish that it had not been something that the international community was not capable of dealing with," Albright told PBS in a 2004 interview.
Black Hawk Down effect
Campbell traced the U.S. reluctance to get more involved in Rwanda to the infamous intervention in Somalia less than two years earlier.
With famine and political dysfunction causing widespread starvation, the United States sent Marines to the East African country in December 1992 as part of an international force intended to restore order and get aid properly distributed.
However, the lack of functioning governance led to increasing sectarian violence, an expanded U.S. mission and the Battle of Mogadishu in October 1993, in which two U.S. Black Hawk helicopters were shot down and 18 American soldiers died while more than 70 were injured.
The event, which inspired the Hollywood film "Black Hawk Down," turned public opinion against continued U.S. involvement in Somalia.
"It showed the extremely limited domestic tolerance for intervention in Africa, particularly if it involves American lives," Campbell said.
He praised France for sending troops to Central African Republic now, noting a similar French commitment to a former colony when it intervened militarily in Mali in January with 4,000 troops to battle Islamist militants.
"The French seem to have much greater tolerance for casualties but also much greater support for French intervention" in countries it once colonized, Campbell said.
A caretaker role for its former colonies provides France with a sense of national prestige for its sphere of influence, as well as support as part of a Francophone bloc in international bodies such as the United Nations and World Trade Organization, he said.
Expert: Proper intervention saves lives
Stanton also lauded France for sending forces, but said the world needs to do more. He called for a much stronger military intervention, calling it the only way to effectively prevent what he labeled "serial killers going around and killing civilians."
"If you can send in a force that's so awesome that it will scare these militias into actually stopping and dropping their arms, you'll actually save lives," he said, asserting that the cost-effectiveness of intervention was far superior to dealing with the aftermath.
"For maybe $200 million we could have stopped the Rwandan genocide" instead of spending billions on relief aid, Stanton said, adding: "It's always less expensive to stop a genocide than to clean up afterwards."
In the 2004 PBS interview, Albright agreed with Stanton but said the realities of U.N. and U.S. politics at the time made such an intervention impossible.
"In retrospect, the thing that might have made sense is for a massive humanitarian intervention led by a major country; if not the U.S., then somebody else," she said. "But that was not even vaguely in the cards at the time."
Samantha Power, the current U.S. ambassador to the United Nations, won a Pulitzer Prize for her 2002 book "A Problem from Hell: America and the Age of Genocide" that posed the question of why the United States would "stand so idly by" when mass atrocities occur.
In a 2003 speech, Power described how the visceral reaction to genocide was to look away instead of getting involved.
"It's almost as though the worse the crime, the more likely we are to say, 'ugh, who can begin to go there, who can begin to think about making a difference when you have 8,000 people being murdered a day and bodies piling up around the U.S. Embassy and other outposts' " she said.
U.N. Convention on Genocide
For years, Power noted, Congress avoided ratifying the 1948 U.N. Convention for the Prevention and Punishment of the Crime of Genocide, initially because senators from Southern states feared "Jim Crow" discriminatory laws could be cited as violations.
Even when the United States joined the convention in 1988, the pact had "very little bearing on the U.S. response to subsequent genocides," Power said.
In particular, she said, U.S. leaders refused to use the "G-word" to describe conflicts because "the feeling was in the United States government that it would oblige the United States to do things that it was otherwise ill-inclined to do."
After Rwanda, the United Nations and U.S. policy sought a more collaborative relationship with African nations on regional peacekeeping, partly to enable faster reaction and partly to avoid getting the full blame for failures as occurred with Rwanda.
"There has been a confluence between the Western and African approaches, which is African solutions to African problems, but with significant Western support but not boots on the ground," Campbell said, attributing the change to uncertain public support in Western countries for African intervention. "No democratic government can pursue very long a policy of outside intervention without popular support."
For the Obama administration, the issue of African intervention has been influenced by efforts to contain expanding al Qaeda influence on the continent.
President Obama's policy
A new policy announced in 2012 aimed at preventing mass atrocities included a series of steps at home and abroad that reflected better planning mechanisms and more collaborative efforts.
In a fact sheet released in May on the progress of the new policy, the administration cited the creation of an Atrocities Prevention Board comprising officials from across the government and military including the State Department, Pentagon, Treasury, Justice Department, Homeland Security, CIA, the vice president's office and the U.S. Agency for International Development.
According to the fact sheet, the board identifies emerging atrocity threats, assesses the risk of mass atrocities and takes steps to "ensure that atrocity threats receive adequate and timely attention."
However, there has been little public information on the board beyond the fact sheet, which listed steps taken so far including enhanced early warning measures, expanded use of sanctions and offering rewards to crack down on perpetrators, and "sharing the global burden by strengthening multilateral institutions and bolstering international peacekeeping capabilities."
That has meant involvement of the U.S. military in some cases.
"In central Africa, U.S. forces and civilian experts continue to advise and assist regional partners to counter the Lord's Resistance Army (LRA) , building on our comprehensive strategy, which also includes protecting civilians, encouraging defections, and providing humanitarian assistance," the fact sheet said in reference to the notorious armed group originally from Uganda now on the run in the region.
U.S. airlift of French, African Union troops
The administration announced this week that it was committing $60 million to support the French and African Union troops in Central African Republic, including planes to transport them in and out of the country.
"We are willing to provide the airlift. That is a huge change," Stanton said. "We weren't willing to do that in Rwanda."
The tactics reflect Obama's preference for taking a supporting role in international operations, such as providing support for NATO intervention in Libya in 2011 led by European allies Britain, France and Italy.
Violence has plagued Central African Republic since a coalition of Muslim rebels deposed President Francois Bozize in March, the latest in a series of coups since it gained independence from France in 1960.
French troops deployed alongside the African forces in a peacekeeping mission aimed at restoring security, protecting civilians and ensuring access to humanitarian aid.
It was unclear if it might escalate into the kind of slaughter that occurred in Rwanda, something that Albright warned in 2004 was hard to detect.
"The truth is that, unfortunately, every genocide ends up being slightly different, and they look more evident in retrospect than they do at the time," she told PBS. "One would hope that the lessons of Rwanda would be that you have to respond instantly. But you can't be sure."
CNN's Pierre Meilhan, Laura Smith-Spark and Nana Karikari-apau contributed to this report.