Agreed. Totally un-presidential and tweaking the other largest nuclear superpower in the world at the same time. Plus, assuming he DOES actually send in missiles (why? Whats the US National interest here?), hell have done exactly what he always chided Obambi for - broadcast your moves.
Get with it, Donald. We know you have a lot (too much) on your plate but this is not Presidential. You really need someone to start filtering your tweets.