Regarding the T55, here's an old Forgotten weapons Q&A with Nicholas Moran, where he says the T55 is just about the oldest MBT that could still play a role on the battlefield.
Russian SSBNs are not capable of independent blue water operations. They can operate in the open, ocean but require replenishment. They don't have the air recycling systems of US subs, and lack the ability to run silent for extented peroids. And except for their latest Delta subs, they also must surface to fire. Instead of spooky SURPRISE NUCLEAR BUTTSEX platforms they are more like mobile silos. Their torpedo loadout is laughable because they're always intended to be screened by attack subs and surface fleets.
The French had massive issues with the development of their 2nd generation SSBN's. From the hulls themselves to the M51 missiles. They were locked out of US and UK support so had to develop everything indigenously.
They were also fairly open about the problems they were having particularly with the M51's being launched while surfaced and the accuracy of the missiles themselves. They got them resolved eventually but it was extremely expensive, and they had to essentially recreate the development work of the US and UK.
People can laugh at the French but their defense and nuclear sectors are cutting edge. So I really wonder just how serviceable Russian SSN's are.
My thoughts too about the monitors, but I think that makes @Blatant hypocrite 's point more valid about that being insecure coms. I still wouldn't have let them get a pic of the screen because of all the shit you can glean from it. Or who knows, maybe that's secret Ukraine Command comms, its really hard to tell. Slavs gonna Slav after all.
The British army had this problem with their Radio system BOWMAN came into service, it was shit, and some of the vehicle mounts were actually dangerous. The army did the normal thing and insisted there was nothing wrong with it, then Iraq happened, so they just started giving out Nokias and various civvie radios.
After the spectre of 'corporate manslaughter' started to appear on the horizon, after the killing of the 6 RMP's, it became a rule in theater that you could not go out beyond the wire without another form of comms other than Bowman.
When soldiers lose confidence in kit that's it, no amount of 'education' will get it back.