Playing Nuclear Chicken – or is it Russian Roulette?

“It was not immediately clear how close the U.S. military recon jet was flying near Kaliningrad, a Russian enclave between NATO allies Poland and Lithuania. This fall, Russia moved nuclear-capable ballistic missiles to Kaliningrad, putting some European capitals in strike range.” — Armed Russian jet comes within 5 feet of US recon jet
“At the end, we lucked out. It was luck that prevented nuclear war. We came that close to nuclear war at the end. Rational individuals — Kennedy was rational, Castro was rational, Khrushchev was rational — came that close to total destruction of their societies. And that danger exists today. The major lesson of the Cuban Missile Crisis is this: The indefinite combination of human fallibility and nuclear weapons will destroy nations.” –U.S. Vietnam “War” Defense Sec. Robert McNamara, The Fog of War
So, is it just “Nuclear Chicken” – or is it Russian Roulette?  Or maybe both?
And will M.A.D. still work after all these years?