If you think violation of international law and infringing upon sovereignty territorial integrity is "No problemo" , then perhaps you forgot about the "Century of Humiliation" and loss of Hong Kong and other Unequal treaties. Among the 8 nation alliance, the US only acquired an concession, whereas Russia annexed large swathes of Qing territory (Trans-Amur Baikal). If China ever became weak again, who knows, Russia might exercise the same adventurism on Chinese territory once again.
As a matter of principle, I am against White imperialism (Russian or American) because such brazen imperialism can happen to China in future if it is ever weak again (e.g., Unequal treaties)