I'm not sure how discouraging Russian and Islamic expansionism is somehow 'seeding war.' I don't recall Saddam Hussein's invasion of Kuwait being 'seeded' by the U.S. During the Korean War, it was the Chinese supported North that attacked the South. How about Tibet? Or pretty much every conflict in Africa? This "America as invader" meme has no basis in reality or fact. The U.S. just doesn't sit around throwing darts on maps to pick countries to invade. We could suggest that countries like France in Africa and Indochina, the British with Northern Ireland and the Faulklands, the Germans (twice) in Europe, the Italians in Ethiopia and Libya, the Egyptians in the Six Day war and the Yom Kippir War.. The U.S. has been the belligerents in very few conflicts. We could talk about the Cubans in Grenada, the Soviets in Afghanistan..
The U.S. isn't perfect, but they definitely don't spend their time invading their neighbors because of some ethnic claim or another. The U.S. is involved in many places but there's a big difference between getting involved defensively as opposed to offensive, territorial-grabbing objectives such as seen in the Ukraine and the Caucasus.
By the way, I am not passing judgement on any country; it's just important to maintain perspective based on facts and not some knee-jerk assumption.
Ask Poland and the Baltics if they want the U.S. around. Huge majorities would say yes. Woukd you rather have the US sit in the sidelines while Russia marches unchecked to the German border?