Ирония судьбы, или С легким паром (The Irony of Fate, or Enjoy Your Bath!)
Erin and I watched this 2-part Russian TV movie from 1975: Ирония судьбы, или С легким паром = The Irony of Fate, or Enjoy Your Bath! I enjoyed it a lot. Good acting, clever story, funny situations, great music (one song has lyrics by Boris Pasternak!), and a nice period piece.
There are articles about it on IMDb and Wikipedia, both with fun details. In Russia it is apparently shown every New Year's Eve or Day and has become a seasonal favorite in the same way It's a Wonderful Life is in the United States.