Since launching the full-scale invasion of Ukraine in February 2022, Russia's president has been railing against the US-led Nato alliance - and described every pledge of military support by the Western allies for Ukraine as a direct involvement and warned of retribution.

The Kremlin said on Monday that Russia would respond to what it called a reckless decision by Joe Biden's administration to allow Ukraine to fire American missiles deep into Russia, which it said would draw the United States directly into the conflict.

The Kremlin said on Monday that any U.S. decision to allow Ukraine to fire American missiles deep into Russia would mean it was directly involved in the conflict, which it accused President Joe Biden's administration of escalating.