For full coverage of the crisis in Ukraine, visit Flashpoint Ukraine.

The latest developments in Russia’s war on Ukraine. All times EDT.

12:02 a.m.: A top Russian official accused the U.S. and its allies on Saturday of trying to provoke the country’s breakup and warned that such attempts could lead to doomsday.

Dmitry Medvedev, the deputy secretary of Russia’s Security Council chaired by President Vladimir Putin, warned the West that an attempt to push Russia toward collapse would amount to a “chess game with Death,” The Associated Press reported.

After attending Saturday’s farewell ceremony for former Soviet leader Mikhail Gorbachev, Medvedev published a post on his messaging app channel, referring to the 1991 collapse of the Soviet Union and accusing the U.S. and its allies of trying to engineer Russia’s breakup.

Medvedev alleged that some in the West would like to “take advantage of the military conflict in Ukraine to push our country to a new twist of disintegration, do everything to paralyze Russia’s state institutions and deprive the country of efficient controls, as happened in 1991.”

“Those are the dirty dreams of the Anglo-Saxon perverts, who go to sleep with a secret thought about the breakup of our state, thinking about how to shred us into pieces, cut us into small bits.” Medvedev wrote. “Such attempts are very dangerous and mustn’t be underestimated. Those dreamers ignore a simple axiom: a forceful disintegration of a nuclear power is always a chess game with Death, in which it’s known precisely when the check and mate comes: doomsday for mankind.”

Medvedev concluded by saying that Russia’s nuclear arsenals are “the best guarantee of safeguarding the Great Russia.”

Some information in this report came from The Associated Press.