/u/kochevnik81 goes into the idea of a Marshall Plan for the USSR, and why it didn't happen here:

https://www.reddit.com/r/AskHistorians/comments/i98k60/why_didnt_the_united_states_create_a_marshall/g1h9dvt/

They discuss the massive losses in GDP post-soviet states experienced in the 90's here: https://www.reddit.com/r/AskHistorians/comments/f3bzh4/in_the_1990s_ukraine_is_reported_to_have_lost/fhilb1x/

They discuss the general alignment of Russia post USSR, and discuss 'Shock Treatment' a little bit here: https://www.reddit.com/r/AskHistorians/comments/xsvssz/to_what_extent_did_postussr_russia_attempt_to/iqmv43c/

They discuss Poland's post-soviet experience here: https://www.reddit.com/r/AskHistorians/comments/ayjz4d/why_was_polands_transition_to_capitalism_so_much/ei37ge8/