Russia's Foreign Ministry said 'certain progress' was achieved during talks between Russia, Germany, France and Ukraine in Berlin on ways to end the military conflict in eastern Ukraine.
The ministry said in a statement all parties agreed to continue talks in the same format to prepare 'concrete proposals' for the heads of government in Russia, Germany, France and Ukraine.
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Among those murdered was Keith Palmer, an unarmed constable who "did his job and never wanted any fuss."