You mistake my intentions for saying what I say. I'm not caping for white Americans. I don't know if, necessarily, Trump voter Americans are substantially different to the average Russian in terms of attitudes.
But putting that aside, the reason America historically acted to stop Russia is to advance American interest and profit, not to help any black or brown countries. American elites have elite education in places like the Pentagon, the CIA, and so on. When they leave government, they often get jobs in corporate America like dikk Cheney did. However, American elites can't get hefty million dollar salary jobs from American oil companies if a Russian oil billionaire gets to a ripe oil country first. So what does dikk Cheney do?
He orders Harvard educated CIA agents to do whatever is necessary to stop Russians from interfering in African affairs. Only Americans, he reasons, can kill off African leaders trying to help their people. Of course this reasoning is becoming extinct now that American elites like Trump are becoming more race-conscious, and partnering with the Russians. Putin is already expanding Russian empire in the Ukraine. He'll get to Africa eventually. It'll just take time.