I'm not sure where you're going with this TNF. Are you saying that without the pivot or US presence in the area there wouldn't be any conflict over the Senkaku Islands? Do you think China would have just not cared if it wasn't for American presence?
TNF is a Marxist-Leninist. It is reflexive.
There is no other way to explain how one can attribute increasing tensions in East Asia to "U.S. (as in "U.S imperialists"?) sabre-rattling". It as if people in Taiwan, South Korea, the Philippines, Vietnam, and so forth, have no agency beyond being "imperialist running-dogs". And of course any talk of "encircling Russia" is just whataboutery.