Why in the heavens would Russia want parts of Eastern Europe? If you have no doubts about that, please tell me any sign of that!
On the contrary, I think. They have many problems, don’t need more to deal with. The most serious is reproduction, birth rates are very low, no need for war at all. One for the Suwalki Gap would cause an all-out war, which brings much more destruction and chaos, than keeping the status quo. Even an idiot like me sees that. And the Russians are not famous for getting into wars hot-headed, on the contrary. There is a saying for that: “The Russian is slow to saddle, but gallops fast.” Their war of attrition in The Ukraine is a very meticulously executed operation, a ‘death by thousand cuts’, which is originally alien to the Russian soul. They don’t like the Eastern way of torture, which the CIA got very fond of. Most of the voices from the Russian populace and politicians in the last few years are calling to put an end to it as soon as possible. Putin is holding back the reins. He is the moderate one in the Kremlin, quite contrary to your and of the West’s common belief/doubts (acquired through the propaganda).