The U.K. says it has information that Moscow is plotting to install a pro-Russian leader in Kyiv, as fears of an invasion of Ukraine persist.

The assertions, offered without a timeline on the intelligence, were contained in a U.K. Foreign Office statement Saturday as tensions over Russian activity around Ukraine continue to build.

Yevhen Murayev, a former Ukrainian member of parliament, is a potential candidate, according to the statement. In Washington, a National Security Council spokeswoman called the alleged plotting "deeply concerning.” President Joe Biden also met with his national security team on Saturday to discuss continued Russian aggression toward Ukraine, according to a White House official.