North Korea, Iran, Russia and China are perceived as our greatest enemies. Trump is kissing Putin's a** while offending China. Does he have a clue at all of how to deal with international affairs and what the leader of the US needs to do to look after our interests on the world stage?
And the biggest problem is that he told Japan and South Korea (China's biggest regional enemies) to pay for their own defense themselves. He's annoyed China by talking to Taiwan's president.
He doesn't have a coherent policy, it's just "ah, I feel like doing this now" and seeing what the fuck happens. The Chinese have basically told their people that Trump doesn't have a fucking clue what he's doing.