By Sabine Siebold and Ingrid Melander BRUSSELS (Reuters) -The European Union should deepen sanctions on Russia to target its lucrative energy sector, the foreign ministers of Lithuania and Ireland said on Monday at the start of a diplomatic flurry over how to punish Moscow for its invasion of Ukraine. The European Union (EU) and allies have already imposed a panoply of measures against Russia, including freezing its central bank’s assets. Russia’s siege and bombardment of Mariupol port, which EU foreign policy chief Josep Borrell called “a massive war crime,” is increasing pressure for action….