Russia has protested to Germany's new ambassador over comments by the German finance minister. Wolfgang Schäuble likened the Russian takeover of Crimea to the Nazi annexation of the Sudetenland in 1938.
As Ukraine and separatist rebels prepare for new talks, the US has imposed more sanctions against Russian-controlled Crimea. President Obama has prohibited American exports of goods or services to the annexed area.
EU leaders at their summit in Brussels are defending tough economic sanctions against Russia, but pressure to ease their stance is growing. Christoph Hasselbach reports from Brussels.
Russia has dismissed the latest sanctions imposed on it by the US over its annexation of Crimea. President Vladimir Putin has said his country would not be intimidated or isolated over the Ukraine crisis.
Germany's Angela Merkel has demanded a meeting on the Ukraine crisis. In a phone call with Ukraine's Poroshenko and Russia's Putin and French President Hollande, Merkel said a lasting peace treaty was needed.
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