By Marwa Rashad and Isla Binnie LONDON/MADRID (Reuters) – The European Union plans to create a benchmark for liquefied natural gas (LNG) to establish fair, market-based prices for gas imports that could eventually ease price differences among the bloc’s different gas hubs and reduce market volatility. Following Russia’s invasion of Ukraine, Europe has become a prime LNG market, procuring massive amounts of the seaborne fuel to replace Russian pipeline gas that used to make up almost 40% of the continent’s imports. Major price divergences among gas hubs in the bloc are caused in part by their d…