remember: Siberia is claimed by China. They have sent in a lot of Chinese immigrants to work there, and if what we see in the Philippines is true there, a lot of them will be men of military age who could help an invasion (or just arrange to vote to leave Russia and join China).
Russia will need US help to counter Chinese imperialism in Asia: China is already moving against Taiwan, and have made moves to annex land in neighboring countries, i.e. Japan, India, Korea, the Philippines and Vietnam.
China seems to be the wild card in the new geopolitics arena. Looks like Trump may feel it’s more important to have Russia as a partner than Europe, who is so worried about containing free speech while surrendering to the Muslim refugees.