Trump and Article 5 of the NATO rules

Article 5 provides that if a NATO Ally is the victim of an armed attack, each & every other member of the Alliance will consider this act of violence as an armed attack against all members & will take the actions it deems NECESSARY to assist the Ally attacked.

I have stated before that I have concerns that Trump would support nations of NATO if Russia attacked.  Many think that he would obey Article 5.  I think that he would and would take the actions that he felt was necessary to assist the ally which had been attacked. And I suspect that such actions would in essence, be nothing.