What measures could the West take if there was a nuclear strike and what would it mean for Putin?

NATO has been assessing what its response would be should the Russian president escalate even further in his attack on Ukraine. Speculation over whether or not Vladimir Putin will use nuclear weapons has been rife and the consequences could be disastrous for the West and the Russian president With Russia's invasion stalling and the Ukrainian attack on the Kerch Bridge have both contributed to increased concern Putin could escalate from conventional weapons to a tactical nuclear strike. The US President Joe Biden said last week that the world was the closest it had been to "Armageddon" at any point since the Cuban Missile Crisis, after more sabre rattling from the Kremlin. NATO says that such a move would probably lead to a "physical response" from Ukraine, her allies and even NATO itself. It said any use of nuclear weapons would have "unprecedented consequences" and that Moscow was using its nuclear threats mainly to deter NATO and other countries from intervening directly in Ukraine.