Russian President Vladimir Putin has issued a stark warning that NATO, the United States, and European countries will be considered at war with Russia if they allow Ukraine to use long-range Western missiles to strike deep into Russian territory. He emphasized that such a move would fundamentally change the nature of the conflict, necessitating 'appropriate decisions' in response. This comes as U.S. President Joe Biden and British Prime Minister Keir Starmer discuss easing restrictions on the use of these missile systems to support Ukraine. The Kremlin has already taken punitive actions, including expelling six British diplomats accused of espionage. Despite Putin's threats, Biden remains committed to supporting Ukraine, affirming that Russia will not prevail in the conflict. Analysts suggest that the use of long-range missiles would require NATO's satellite intelligence, effectively involving NATO directly in the war.