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By Arshad Mohammed and Alexei Anishchuk GENEVA/MOSCOW (Reuters) - The United States, Russia, Ukraine and European Union together called on Thursday for an immediate halt to violence in Ukraine, where Western powers believe Russia is fomenting a pro-Russian separatist movement. Washington immediately warned Moscow that it would face further sanctions if it did not carry out the agreement, reached in four-party crisis talks in Geneva. Russian President Vladimir Putin, speaking in Moscow, accused Ukraine's leaders of committing a "grave crime" by using the army to try to quell unrest in the east of the country, and did not rule out sending in Russian troops.
18:30 GMT - WE ARE NOW CLOSING THIS LIVE REPORT after Russia, Ukraine, the US and EU reached a surprise deal to de-escalate the worsening crisis. The four parties agree to "restore security for all citizens", including a call to disband armed groups that have taken over buildings in Ukraine "illegally". While not spelt out in the agreement, these groups could refer to pro-Kremlin separatists who have seized control of government buildings and taken over parts of Ukraine's southeast, destabilising the country. Washington and Kiev have accused Russia of supporting the militants who have occupied buildings such as police stations and government bases, but Moscow has always categorically denied this.