Sanctions made things worse, but Baltic countries and Poland were leaving Russian and Belarusian gas, oil and coal for long time making it not great before Russia attacked Ukraine. Estonia left Belarusian gas a month before the attack, same as Poland banned import of Russian coal causing shortage of coal locally. The countries were doing it for decades, slowly but surely moving to others sources of fuels. The sanctions only accelerated this energy crisis that was in the making. The countries are not super relevant and I wasn't able to find many sources for it in English, but here are some:

08.12.2014 https://www.reuters.com/article/baltic-gas-idUSL6N0TS2T32014...

17.10.2018 https://www.washingtonpost.com/world/2018/10/17/eastern-euro...

03.02.2022 https://news.err.ee/1608487619/estonia-suspends-all-oil-tran...