By Jarrett Renshaw and Nina Chestney BRUSSELS/LONDON (Reuters) -The United States will work to supply 15 billion cubic metres of liquefied natural gas (LNG) to the European Union this year to help it wean off Russian energy supplies, the transatlantic partners said on Friday. The EU is aiming to cut its dependency on Russian gas by two-thirds this year and end all Russian fossil fuel imports by 2027 due to Russia’s invasion of Ukraine. Russia supplies around 40% of Europe’s gas needs. Concerns over security of supply were reinforced this week after Russia ordered the switch of gas contract pay…