Well, the fraction of Russian LNG can't be higher than the overall fraction of Russian LNG on the world market right? Because prices for it are the same everywhere - a tanker operator can send it wherever prices are the best. It means a really small fraction. And most importantly, Russians can't threaten to cut it, because it simply means removing some of the supply from a large, uniform pool - if they do it they won't harm anyone in particular, just make LNG everywhere uniformly more expensive - and deprive themselves of money. With pipelines, they could actually imperil supply in a particular place.
Also, Russian LNG will be let go of rather soon, this is in the upcoming sanctions package.