In the U.S., we have something called 'freedom of peaceable assembly'. What that means, is that foreigners, such as Russia and China, could come into the United States and legally form political parties. Those parties could promote whatever they want, including pro-Russian and pro-Chinese policies. As long as the assembly (the political party), remains peaceable, it has the right to exist as protected by the constitution.

I just thought i'd let you guys know, in case you wanted to form some new political parties in the United States.