In the Shanghai Communiqué (https://history.state.gov/historicaldocuments/frus1969-76v17/d203), "The United States acknowledges that all Chinese on either side of the Taiwan Strait maintain there is but one China and that Taiwan is a part of China."

I didn't say Putin had the right to invade Ukraine but Russia's Strategic and Military Operation in the Donbas has far more justification than the USA's occupation in Syria.