Could be a military coup. Sounded like the military refused orders to take part in the invasion of Ukraine so maybe elements are actually moving to get shot of Putin’s poodle.
If it is, and big if still, can't decide if it's a good thing or not! It'd mean a huge amount of Russias troops in the north of Ukraine are more or less cut off from supply so while that sounds good could it be the excuse Putin needs to do something really really dumb.