By Katya Golubkova and Dmitry Zhdannikov MOSCOW (Reuters) - Dozens of Russian energy ventures are in jeopardy due to Western sanctions on technology and funding. Looming over them all, a giant project the Kremlin is bent on saving no matter what. The Yamal plan, a $27 billion investment to tap vast natural gas reserves in northwest Siberia, aims to double Russia's stake in the fast-growing market for liquefied natural gas. If it stays on track, it will also show the West that the world's largest energy industry is not cracking under sanctions. ...