I guess I would answer that by saying if someone is pointing a gun (or an ICBM) at me, I don't concern myself too much with their back story. As far as WWII goes, Stalin collaborated with Hitler on the invasion of Poland and thus launched the War. Prior to WWII, German troops sometimes trained in Russian territory to avoid restrictions placed on Germany under the Versailles Treaty.
Our entire society got skewed up by 50 years of Cold War. How many Americans were killed or wounded by munitions designed and/or manufactured by the Russians? Soviet pilots flew Russian MIGs in Korea and Vietnam and shot down American pilots. How many American POWs were dragged off to die in the Soviet Union in those conflicts? And just a few days ago, Russian nuclear-capable aircraft were playing games with our air defenses. I'm very sorry, I just can't consider Russians to be our friends in any meaningful way.
I would add that the Soviets infiltrated our media and other institutions with their propaganda. They are part of the reason why the anti American left is in power in our country and is destroying it.