Indeed, I don't think they have any realistic possibilities, except perhaps some very opportunistic attacks on some areas with a large Russophone population. Places like Narva in Estonia could possibly fall, and they'd probably get away with attacking Georgia again, but they definitely don't have the means to do any real damage now.
This is what is so infuriating about Trump. Russia has serious problems, they haven't been able to liberate the part of Kursk under Ukrainian occupation, and despite everything that they've thrown at Ukraine, they've only managed to progress about 35km from the old front lines in Donetsk. They are bleeding heavily, and they have no prospect of making any serious and substantial gains at the moment. With Ukraine producing more and more drones, every forward advance is costing them dearly, and it's obvious that they don't have the training to deal with the threat of drones.
Having said this, my gut feeling right now is that Russia is hoping to seize the whole of Donetsk Oblast before transforming into a defensive force. They know they don't have the ability to overthrow Kyiv, but controlling Donetsk Oblast is definitely possible.