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The US Department of Defense is worried about China's large nuclear expansion, as it is conducting military exercises near the two oceans to seize Taiwan. Do you think there is an upcoming war between China and USA?

We can be pretty sure that there will be war between the US & China, if the US supports Taiwan in case of an invasion. Because that invasion will most probably come in the next few years. If emperor Xi stays in power, that is. If he is ousted, it may take a bit longer.

Taiwan's foreign ministry wants to strengthen its defense with US supplies for peace. I think USA goal is to sell arms, its interest is for joining China or no in your opinion?

The US has every incentive to support Taiwan staying independent. If China conquers Taiwan, it has control over some of the most important shipping lanes in the world.