United States Special Representative for Ukraine Negotiations Kurt Volker has accused Russia of worsening the situation in Donbas, eastern Ukraine, including the live of its Russian-speaking residents.

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"For the last five years Russia's fighters and proxies have made life worse for the people in Donbas including the Russian-speakers it claims to care about," he wrote on Twitter on May 10.

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"Russia should end the fighting, implement Minsk agreements, and allow reconstruction and reintegration of Donbas back to Ukraine's control," he added.