As a map some days ago showed, Canada, Greenland, Panama, probably Israel, maybe even Ukrain - it’s all about shipping lanes.
All that effort makes sense if there is the believe that global trade will increase and that the USA will still be relevant when the center of the global population is in Asia.
So extinction is not the goal but could be an accepted risk.
He knew that before Trump’s election but didn’t make it an issue. He also knows that it implies that Russia will never attack Poland, let alone Poland allied with Europe.
What’s the real need for the strengthened military?