The head of NATO’s military committee says that Ukraine has the solid legal and military right to strike deep inside Russia to gain combat advantage, reflecting the beliefs of a number of U.S. allies.

NATO Secretary General Jens Stoltenberg is sceptical of Russian leader Vladimir Putin's threats, which come amid discussions about allowing Ukraine to launch long-range missiles deep into Russia. Source: Stoltenberg in an interview with The Times,

Russian President Vladimir Putin has warned NATO alliance leaders that a move to lift restrictions on Ukraine’s use of longer-range Western missiles to strike deep inside his country would be considered an act of war.