Trump gets tremendous credit for doing what Obama and Kerry merely talked about, namely, doing not much. But symbolism counts and Trump has certainly given world leaders pause for reflection. From The American Interest:
Back in the real world, however, the strike was being read for what it is: a demonstration that this Administration is less reluctant to use force than the one that preceded it. And though Russia was the big power most directly challenged by the strike, Putin was perhaps not even the primary intended recipient of the message. The strikes occurred just as President Trump was having dinner with Xi Jinping of China, and, according to AFP, Trump delivered the news to Xi personally. The subtext was unmistakeable: Get serious about North Korea; our recent threats were not idle. Don Corleone himself couldn’t have set a better table.
China won't tolerate a Korea unified under Southern leadership aligned with the West. But they do have an heir to the throne handy if Trump starts to seem even more problematic than Kim Jonh Un.