How would USA withdrawing from conflicts such as Ukraine and the Middle East not facilitate the expansion of Chinas sphere of influence? Both Russia and Iran being now dependent upon Chinas international trade and payments systems...and only able to function as regional aggressors because their ongoing trade with China who defy the US sanctions against trade with Russia and Iran. A withdrawal of US support for Ukraine and Israel would surely encourage an increase and spread of military aggression from Chinese client/proxy states across Europe and the Middle East and probably the seizure of Taiwan by China directly.