Sanctions beget sanctions, American sanction are aimed at damaging the economies of the countries they target. Problem is for the US administration that there are a number of players in the international market that are big enough to retaliate, China being one that has retaliated against US sanctions and returned the economic damage back to the US economy and the Russians who don't care at all if the fracking industry in the US goes bust.
I would rather see the US administration start spending money on ordinary Americans, health care, infrastructure, social welfare and so on, not keep p*ssing American taxpayers money on useless military junk and endless schemes to try and control the world. The US dollar is being dumped by more and more countries around the world as many countries no longer trust the US and among the reasons is the endless sanctions that are motivating the US dollar dumping.
I will hold my breath on Trump, if he drains the swamp he will have done a great service to ordinary Americans.