(CNN) -- Demonstrators pack public squares. Flames shoot into the air. Tear gas sends crowds scrambling. Bodies are carried from the streets.
Dramatic scenes are unfolding during anti-government protests in three disparate countries this week, on three different continents.
The images are striking, and things are heating up quickly. What's happening on the ground?
Here's a cheat-sheet guide to the protests in Ukraine, Venezuela and Thailand:
What are the protesters' demands?
Who's a better economic ally, Europe or Russia? That's the key issue at the heart of Ukraine's protests. Demonstrators want the government to forge closer ties with Europe and turn away from Russia.
But the dispute is also about power. Many in the opposition have called for the ouster of President Viktor Yanukovych and the ordering of new elections. And both on the streets and in parliament, they've also pushed to alter the government's overall power structure, feeling that too much of it rests with Yanukovych and not enough with parliament.
An opposition coalition has been leading the charge against Yanukovych and his allies.
On CNN iReport, protesters and onlookers have shared more than 100 photos and videos of clashes between demonstrators and police. The nighttime images are especially striking -- figures are silhouetted against large bonfires set alight in the streets.
When did the demonstrations start?
In November, thousands spilled onto the streets after Yanukovych did a U-turn over a trade pact with the European Union that had been years in the making -- with Yanukovych favoring closer relations with Russia instead.
What's the latest?
Long-simmering tensions exploded anew in Ukraine on Tuesday as clashes between police and anti-government protesters left more than 25 people dead and the capital's central square on fire.
A shaky truce agreed to late Wednesday disintegrated by the next morning, as gunfire erupted again in the square. At least 100 people have died and 500 have been injured since Thursday morning, the head of the protesters' medical service told CNN.
The Ukrainian government has not released an updated figure, but the Interior Ministry said earlier that one police officer was among the dead.
Foreign ministers from Germany, France and Poland met with Yanukovych on Thursday and are to meet with opposition leaders too. European foreign ministers convened an emergency meeting in Brussels, Belgium, where they are considering sanctions against Ukraine.