“The assertion that more military units are needed in Europe implies that America’s nuclear deterrence is insufficient to do the job on its own. There are only two reasons why this might be the case. The first is that America has incorrectly signaled to Russia that nuclear weapons will not defend the Baltics. The second, is that President Trump’s transactional mindset and past musings on not upholding mutual defense obligations are serious and have signaled to Russia Trump’s ambivalence towards NATO.” Real Clear Defense