French President Emmanuel Macron is meeting Russian leader Vladimir Putin in Moscow, while US President Joe Biden hosts German Chancellor Olaf Scholz in Washington.
Russia currently has more than 100,000 troops massed on Ukraine’s borders.
Western powers have accused the country of planning an invasion, something Russia has repeatedly denied.
US officials on Sunday said Russia has assembled 70% of military forces needed for a full-scale invasion.
In recent weeks, Moscow has demanded that the Western military alliance Nato ban Ukraine from ever becoming a member, and that the group cuts its troop numbers in eastern Europe.