I agree, and disagree with you. I would agree with you on matters of say, Israel vs. Palestine, where neither side is completely in the right. I would also agree with you for things like Vietnam, Iraq where we only get involved to have a regime favorable to the U.S., and to stop communism. In those cases, our country has a long track record of only looking out for ourselves and not considering the rights of the other nations involved. I'm no communist, but I believe nations should be able to decide for themselves. But this is where I stop agreeing with you. If a Ukraine is being cruelty invaded by Russia, I think we have a duty to prevent WW3, but as a world super power, we also have a duty to help the little guy out. It's not transgressing in foreign affairs when the country in need is asking for help, and has done nothing to provoke the attack, and I think though we are not mandated to help, we do have some sort of duty to.
Ps. sorry for making these so long, I have a lot to say