If poland goes to assist Ukraine, and their troops are attacked in Ukrainian or Russian territory, can Poland invoke Article V of the NATO charter?
Is NATO still operational? NATO used to be the best defense club in the world. Every member was backed by the US and under the American nuclear umbrella.
NATO started to fall apart when Clinton was president. I seem to remember a NATO vs Serbia war. I am still waiting to hear which NATO country was attacked to justify bombing Serbia. It was at that point that NATO started to lose its effectiveness.
The next blow was 9/11. Except for a few notable exceptions (Canada, UK, Germany to an extent) NATO did not immediately spring to America's defense. The only NATO members who fought in Afghanistan (Afghanistan was behind 9/11) were the US, the UK, and Canada.
Add the fact that, under Obama, America's adherence to defense treaties is extremely suspect, and what is left of NATO?