Putin has never forgiven us for what we did to them in Afghanistan. We can look on this as the continuation of Charlie Wilson's War.
I knew that someday, Russia was going to want payback for that humiliation.
And even worse, when we went into Afganistan a few years ago, we wiped out the taliban in a couple of months, and did what Russia couldn’t achieve in all the years they were there. Talk about embarrassing.
Now its a different situation because Russia was trying to permenantly occuy and annex Afganistan into the USSR, and we tried to keep them an independant country which makes things easier, but from Russia’s viewpoint, the US kicked in them in the national pride nads twice.