The enemy of my enemy is my friend.
“The enemy of my enemy is my friend.”
I agree but remember that the man that said that about Stalin, Winston Churchill, was a life time enemy of Stalin and Communism. He knew that after Hitler was defeated that the Allies would have to deal with the Soviets as enemies. We may be able to rely on Putin as a friend for fighting terrorists, but we will likely have to deal with him as a powerful foe later.