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.

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.

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,