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By Justyna Pawlak and Eric Beech BRUSSELS/WASHINGTON (Reuters) - The European Union and the United States on Tuesday announced further sanctions against Russia, targeting its energy, banking and defense sectors in the strongest international action yet over Moscow's support for rebels in eastern Ukraine. The measures mark the start of a new phase in the biggest confrontation between Moscow and the West since the Cold War, which worsened dramatically after the downing of Malaysian flight MH17 over rebel-held territory on July 17 by what Western countries say was a Russian-supplied missile. "If Russia continues on this current path, the costs on Russia will continue to grow," President Barack Obama said in Washington. "Russia's actions in Ukraine and the sanctions that we've already imposed have made a weak Russian economy even weaker," he said.