For whatever reasons, and I think the primary two are that Trump is perceived as very weak (so weak) domestically, internationally, and most of all within the WH,  Russia and North Korea never moved in the manner they have against the US while Obama was President.

Trump's accommodation of and refusal to engage AGAINST Russia defies any logic.  (Why?)   

The upping of ante came with Trump.  

He's screws up and show such poor judgment on so many issues so big and so small (hand sized small).   

Why?  Because Trump is Trump, and America;s enemies have Trump's number.  That is and can be the only conclusion.