I don't know if you saw a couple of days ago Scott Kelly and Mark Hertling explaining 12 ways to screw up your tank, which they translated into Russian. They had heard a lot of Russians were interested in sabotaging their tanks but didn't know a good way to do so. Number one on the list was pour sand in the fuel tank.
Don't know if they are connected. But thought it was a great idea to share the info with the tank crews. Morale is shot, obviously.
http://twitter.com/MarkHertling/status/1522732584215711744?cxt=HHwWgMC4ofbN6qEqAAAA
http://twitter.com/MarkHertling/status/1522726684734148609?cxt=HHwWgsCy2cP256EqAAAA