On FSTDT discord I heard someone saying that, after the tide in the Polish-Soviet War turned in favour of Poland in 1920, Marshal Piłsudski had a plan to launch a counter-offensive invasion of the USSR with the hopes of taking advantage of its unstable state and triggering the collapse of Bolshevism. I haven't been able to find anything about this on the Internet.
Was there any such plan? Was it feasible?
Would you mind elaborating on what counter-offensive you have in mind?
Because, the conflict between Poland and Russian Soviet Federative Socialist Republic (USSR was not yet formed), has ended with Treaty of Riga in March of 1921 after an actual Polish counter-offensive in late 1920.
You can try to look-up "Battle of the Niemen River", which was the last big battle of this Polish counter-offensive.