Why would China try and take Taiwan just because the US was involved elsewhere? It already had that opportunity with both Iraq wars. The difficulty for China in taking Taiwan is not the placement of the US army but rather the 12 aircraft carrier battle groups that can be brought to bear on the situation.
China's airforce is not nearly as modern as the US airforce. The Russian airforce while large in numbers is completely underfunded. Between them, they have one aircraft carrier and it has only been at sea once.
I don't think either have a desire to face the US in battle over Iran.
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