One year ago, Western forces withdrew entirely from Afghanistan, leading to the fall of Kabul into the hands of the Taliban. That was a mistake. Vladimir Putin saw this as a sign of American decline and invaded Ukraine, thinking there would be a limited reaction. That was also an error. NATO, led by the USA, is today stronger than it has been for at least 30 years. This, in turn, is sending a strong message to China and Xi Ji Ping, argues Sir Malcolm Rifkind.