Ukrainian President Volodymyr Zelenskyy says U.S. President-elect Donald Trump is “strong and unpredictable” and those qualities can be a decisive factor in his policy approach to Russia’s invasion of

Russia's point man for arms control cautioned Donald Trump's incoming administration on Friday against resuming nuclear testing, saying Moscow would keep its own options open amid what he said was Washington's "extremely hostile" stance.

Russia considered a nuclear strike on Ukraine. China has warned Moscow against using nuclear weapons, US Secretary of State Antony Blinken told the Financial Times. He notes the United States was “very concerned” because Russian President Vladimir Putin was probably considering a nuclear option against Ukraine.

"We have reason to believe that China engaged Russia and said: 'Don't go there,'" outgoing U.S. Secretary of State Antony Blinken told the Financial Times on Jan. 3.