This sounds like classic libertarian whining
Here's a question for you: If NATO did not exist, would Russia have rushed in to aid the Donbas and support their independence from Kyiv?
The fighters in Donbas that started the move for independence were placed there and armed by Putin. How can you not know that?
“Ukrainian crisis in its early stages,[4] is an ongoing international conflict between Russia, alongside Russian-backed separatists, and Ukraine, which began in February 2014.[f] Following Ukraine's Revolution of Dignity, Russia annexed Crimea from Ukraine and supported pro-Russian separatists fighting the Ukrainian military in the Donbas war. The first eight years of conflict also included naval incidents, cyberwarfare, and heightened political tensions. In February 2022, Russia launched a full-scale invasion of Ukraine”
“The separatists received considerable but covert support from Russia, and Ukrainian attempts to fully retake separatist-held areas failed. Although Russia denied involvement, Russian troops took part in the fighting.“
If Mexico sent troops to Arizona and Mexican Americans joined them to demand Arizona become a separate country with close ties to Mexico, would that be a legitimate separation from the United States?