Yes, we could have ended it yesterday by talking with Putin. We could have prevented by addressing his concerns and not telling him to go pound sand.
LOL, Obama talked with Putin for two years, refusing to give Ukraine weapons, while Putin waged a separatist war in Ukraine.
Ukraine to Get More U.S. Aid, but Not Weapons; Obama Refuses to Budge on Lethal Aid Despite Poroshenko's Passionate Plea in Congress 2014
https://www.congress.gov/116/meeting/house/110331/documents/HMKP-116-JU00-20191211-SD994.pdf