Such sad news but not unexpected.
Recently, I saw the hour-long documentary of Werner Herzog interviewing Mikhail Gorbachev and it was not only riveting television but also one of the saddest and most upsetting I've seen in a long while.
I'm not going to go into details as I don't think I could convey the tone and atmosphere of the conversation and do it justice. All I can say is that if you haven't seen it then you should make an effort to do so.
YouTube doesn't have the full video but there are a few short excerpts from it of a minute or two in length.