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It could be a war between nation, South East Asian Nations and Taiwan and China Bullying, there is a possibility of US to join this confrontation.

Not very likely with the new administration. Maybe a year ago. We will see.

If President Trump put Russia and Ukraine on a peace talks. Then the war in South China Sea will not happening very soon. But we will see, weapon industry will skyrocket if that happens

I don't think he is any kind of master negotiator, but I think he is going to be less likely to get involved in stuff outside of the US