G8 leaders are gathering in Northern Ireland - but differences between Russia and the US over what to do on Syria are already looming large.
While US sanctions against Russia are largely symbolic thus far and a military intervention is out of question, DW's Miodrag Soric says that's not a sign of Obama's weakness. Instead, it's part of a realpolitik approach.
Angela Merkel has told Vladimir Putin that a referendum on Crimea would violate international law. The Crimean parliament's decision to vote on joining the Russian Federation has only worsened the diplomatic stalemate.
Russia's occupation of the Crimean peninsula presents a thorny new challenge for the US president. Domestically, he is under heightened pressure due to ongoing criticism over his foreign policy. What are his options?
Russian President Putin has agreed to a proposal from the German chancellor to form a "fact-finding" mission to calm tensions with Ukraine. The move follows Western outcry over his deployment of troops to Crimea.
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