The White House calls on Russian to withdraw troops from Crimea
The White Nationalists in Ukraine have accused Russia of trying to install a “military presence” in the region.
The U.S. and European allies are urging Russia to halt any move that would “impose further costs on its own citizens.”
A U.N. report said there are now between 300,000 and 400,000 Russian troops in Ukraine.
The White Helmets, a volunteer rescue organization, said on Tuesday that it had rescued more than 600 people from the rubble of a Russian-backed militia building that was destroyed on Sunday.
In the video, a masked man wearing a mask is seen walking toward a building that is being leveled.
In a second clip, he holds up a weapon.
The video ends with the man, identified as a man named Alexander, walking away.
In recent days, the White Helmet has received dozens of death threats, according to a U.K.-based news agency.
Russia has denied the group is an extension of Russian forces.
In an online post, the Russian Embassy in London said: “This operation is completely illegitimate and it is being carried out by terrorists and bandits who have been working for a long time with our government.”
The White Helmet has been providing medical aid to victims in eastern Ukraine since March and has also taken part in humanitarian missions in Crimea.
The group said it was preparing to begin a humanitarian operation in the capital, Kiev.
The organization’s spokesman, Dmytro Shtukhina, said the group would begin distributing food on Tuesday to help the wounded and those who need medical treatment.