What is NATO's strategy for dealing with Putin's invasion of Ukraine?

ANSWER: To give Ukraine only token military support, which essentially means that NATO is willing to give Ukraine only enough military support to allow it to lose the war more slowly but not enough to allow it to win the war.

Why is NATO's response to Putin's invasion of Ukraine so weak? Because NATO is afraid of what Putin might do if his invasion of Ukraine fails. What does NATO's weak response say about NATO? That NATO is spineless and pretty much useless.

Even if Putin invaded a NATO-member country like Poland, for example, I wonder how much support NATO would give Poland? Would it also be just token support?

When Poland offered to give Ukraine some MIG fighter aircraft, the United States first supported the idea until Poland asked that the aircraft be transferred to Ukraine from a U.S. military base in Germany. That is when the United States suddenly decided that the idea was a bad idea.

Why did Poland not want to transfer the MIGs directly from Poland? Because I think Poland suspected that NATO and the United States would not come to its aid if Putin attacked Poland for transferring the aircraft directly from Poland to Ukraine. The fact that the United States and NATO suddenly changed their minds about giving Ukraine the MIGs is evidence that Poland's suspicions were correct.