I don't think wanting a weaker Europe is necessarily part of #Trump's plan.
I think that's the #Putin plan which Trump is either wittingly (for profit) or unwittingly (out of arrogance and ego) executing on Putin's behalf.
Once this settles out Putin will come back for more but #NATO will be out of the picture or simply stand by while the US is devoured just as Trump suggested Putin should do with NATO countries not paying enough #protectionmoney.