By Laura Sanicola and Julia Payne (Reuters) – The Swiss trading arm of Russian energy giant Lukoil has scaled back operations after the oil company cut its supply of capital to guarantee nearly $1 billion in margin calls in the wake of Western sanctions, according to three people familiar with the matter. Litasco, which was handling more than 3.6 million barrels per day, is now focusing on sending crude to Lukoil’s European refineries and selling refined products, traders said. The United States and Britain have targeted Russian energy exports with sanctions after Russia’s invasion of Ukraine …