MILAN (Reuters) -Italian energy group Eni will open bank accounts this week to pay for Russian gas after clarification that such a move will not breach sanctions, two sources said on Monday. In updated guidance on Friday, the European Commission confirmed its previous advice that EU sanctions do not prevent companies from following Russia’s payment procedures which involve opening an account at a designated Russian bank. It said companies can pay for Russian gas – so long as they do so in the currency agreed in their existing contracts and declare the transaction completed when that currency i…