By Steve Holland, John Chalmers and Daphne Psaledakis BRUSSELS/WASHINGTON (Reuters) – The United States and its allies on Saturday moved to block certain Russian banks’ access to the SWIFT international payment system in further punishment of Moscow as it continues its military assault against Ukraine. The measures, which will also include restrictions on the Russian central bank’s international reserves, will be implemented in the coming days, the nations said in a joint statement that also vowed further action to come. “We will hold Russia to account and collectively ensure that this war is …