"There's a diplomatic path forward. We certainly hope they take that path. There's the other path. It is up to the Russians to determine which path they're going to take and the consequences will be severe if they don't take the diplomatic path," Psaki said.
U.S. President Joe Biden's top diplomat, Secretary of State Antony Blinken, will visit Kyiv this week after talks with Russia ended in a stalemate last week amid concerns in the United States and other Western nations that Moscow is preparing to again invade Ukraine.