Exactly. Wars resolve nothing, therefore the Cold War was the best deterrent to Soviet aggression. Under Trump -- and with the right advisers and cabinet -- the military strength of the USA should have been unsurpassed, but at the same time, diplomatic negotiations from a position of strength could resolve many issues.
Had Trump been president when Putin planned the Crimean invasion (which started everything else), he would (hopefully) have been put on notice that Russia, and particularly the Kremlin, would suffer grave consequences if he dared to invade another country. The same with Iran vs Israel.