United States President Joe Biden has warned Russian President Vladimir Putin of a strong Western response should Russian forces advance on the Ukraine border.

The two leaders met via a tense virtual summit, in which Mr. Biden voiced his support for Ukraine’s sovereignty and territorial integrity, and called for de-escalation and return to diplomacy.

Russia has recently deployed a large number of troops to the Ukraine border with unclear intentions, however Mr. Putin claims he considers Ukraine’s alliance with Western nations a growing threat to Russian security.