Putin’s interest in Ukraine has many factors. But, one big reason may be Ukraine’s geographical position: Ukraine borders Russia on one side and NATO nations on the other, and Ukraine is situated along a sea route. If Ukraine joins NATO, then a NATO nation would share a long border with Russia.
Meanwhile, the U.S. VP who had a “special” relationship with Ukraine is POTUS now. Putin despises the U.S. and its influence in Europe. Now he sees a weak POTUS who likes to blame Russia for things with no evidence whatsoever. So, Putin made his move.
I’m convinced this invasion would not have happened if Trump were in office.
Russia is a nuclear power. They’re not afraid of getting invaded. Stories of the Western Eurasian Steppe being an invasion route are from the time when armies moved on horses and needed fodder.