PersonFromPorlock:
It has been clearly explained by the Russian pilots that they did not listen to 121.5 MHz because it is an emergency channel for them and there was no state of emergency, and they were busy with the operation. They were using the "main" channel/frequency to communicate with the planes and ground. And there was no reason for them to switch to 121.5 because they did not cross the border. In the latest interview the survived flight navigator (or a weapon operator) of that Su-24M said that the visibility was great, he saw everything visually, he knew the landscape perfectly well and could even navigate in that area without a map. And he says they did not cross the border. Whatever the Turkish officials draw on the map, the Russians draw a little bit different curves. Who might be the judge? Nobody. Especially as there might be the "tricks" like the one addressed above when the Turkish unilaterally removed the border (see the URL in the post ofG-CPTN).
A-van does this mean Russian pilots in general don't monitor 121.5 or this specific crew involved in this incident? I recall a U.S. west coast flybye several months ago when the Bear pilots said goodmorning or something on 121.5 during 4 July.
I appreciate your insight and comments here, communication is key to understanding. Glad one crew made it back safely, what a cluster.