Russian Defense Minister Sergei Shoigu said Wednesday the "remnants of the Ukrainian military group" located in the Azovstal steel plant are "reliably blocked along the entire perimeter of the plant."
His comments, made on a conference call in Moscow, were reported by the Russian state news agency RIA Novosti.
"Repeated proposals to the nationalists to release civilians and lay down their arms with a guarantee of life and dignified treatment in accordance with international law have been ignored. We continue these attempts," Shoigu said.
The Azovstal steel plant in the besieged city of Mariupol is under "constant fire," Ukrainian officials say as they race to evacuate the remaining civilians holed up in bunkers within the sprawling complex.
Ukrainian President Volodymyr Zelensky said more than 150 people had been evacuated from the complex and are now safe in the city of Zaporizhzhia Tuesday.
In Wednesday's conference call, Shoigu added that the Russian army, together with units of the Luhansk and Donetsk People's Republics, is expanding control over the territories of both regions, according to RIA Novosti.
He also repeated Moscow's warning that it will consider NATO equipment arriving in Ukraine as a legitimate target, according to RIA Novosti.
His latest warning came after Russian cruise missiles hit several locations Tuesday in western and central Ukraine, which Ukrainian officials said were an attempt to destroy the country's transport infrastructure.
Shoigu warned that NATO vehicles with weapons and ammunition for Ukrainian troops will be destroyed in the country.
"The United States and its NATO allies continue to pump weapons to Ukraine," Shoigu said.
"I note that any transport of the North Atlantic Alliance that arrived on the territory of the country with weapons or materiel for the needs of the Ukrainian armed forces is considered by us as a legitimate target for destruction."