Lost of Crimea reduces Ukraine to the permanent status of beggars to Russia. Lose of Crimea to Russia equates to what happened to Mexico when they lost Texas (which then included New Mexico and Oklahoma.) The Ukraine is now a defeated subservient nation to Russia - whether or not Russia invaded or not. Stealing Ukraine's oil and gas potentials including offshore has left Ukraine with a future of Russian dependency and economic ruin.
It was not just Crimea that was defeated, but all of Ukraine. So much for Ukraine believing the USA when they gave up their nuclear weapons. The USA has betrayed nations before, but I can not think of a worse betrayal of another country in USA history. Can you think of one the USA betrayed and lied to worse?
Next is rapid nuclear weapons proliferation around the world.