Reagan made an agreement with Russia not to arm countries on Russia’s border in order for Russia to leave the European countries it was occupying. This worked great until Obama started arming Ukraine in 2014 and literally having the CIA topple another elected government that was semi friendly with Russia. (Imagine Russia arming Mexico not to mention Cuba). Not only that, Russian speaking areas of Ukraine was being bombed by third parties and not protected.
Obama/Biden stirred this pot (manipulated by the CIA?)and the result is tens of thousands of dead Ukrainian and Russian young men and civilians.
Plus, there is no way Russia will ever give up their only southern port.
Frankly, we should have been bringing Russia into the world economy and let them be to financially invested in peace to be doing something stupid..