Germany made the decision to shut down its nuclear and coal powered energy facilities thus making them more dependent on imported energy, especially from the Russians. In contrast, France uses nuclear energy to generate 80% of its electricity.
Trump is pointing out the logical inconsistency of our allies demanding more sanctions on Russia for their seizure of Crimea and invading Ukraine while striking deals with Russia to become more dependent on Russia as the source of a strategic commodity like energy.
What is the source of your assertion that US LNG costs two to three times the price of LNG from Russia?
So, pick a number. In your mind 10% more is fine? 20%?
Face facts, any LNG isn't price competitive with what comes through a pipeline from Russia. Maybe the Saudis can conquer Syria and build a pipeline to Italy to be price competitive but I doubt it. So, it'll be Russia or the Stans for a long time into the future unless they find more gas in the North Sea or somewhere else close to Europe.