Geopolitical tensions between Russia and Ukraine, U.S. gas exports and European pipelines - just some issues complicating a new gas deal.
https://www.cnbc.com/2019/12/16/ukraine-and-russia-look-to-strike-gas-transit-deal.html
https://www.radiosvoboda.org/a/chomu-ec-prodovzhyv-sanktsiji-proty-rosiji/30328536.html
https://www.kp.ru/daily/27067.3/4134892/
https://www.vedomosti.ru/opinion/columns/2019/12/15/818754-gaidar-primer
https://lenta.ru/articles/2019/12/16/gaydar/
https://zn.ua/internal/normandskiy-aysberg-339315_.html