By Jarrett Renshaw ANNAPOLIS, Md. (Reuters) – U.S. President Joe Biden said on Friday that Russian President Vladimir Putin’s attempt to divide Europe by invading Ukraine had backfired and told Naval Academy graduates their job will be ensuring maritime freedom in the South China Sea. Biden told 1,200 graduating cadets in Annapolis, Maryland, that they are entering military service at a time of many global challenges and they will be charged with helping “preserve stability in an uncertain world.” “We’re going to look to you to ensure the security of the American people,” he said. Biden, who h…