Kiev - Pro-Russian gunmen in eastern Ukraine have shown seized European military observers to the media, amid attempts to  secure their immediate release. One of the observers presented in the city of Sloviansk said that none of the group had been harmed. A team from the Organisation for Security and Co-operation in Europe (OSCE) is hoping to begin negotiations. The gunmen continue to occupy official buildings in a dozen eastern cities, defying the government in Kiev. In the latest to be reported, separatists in Donetsk seized control of the regional television and radio headquarters, demanding that broadcasts by Russian state channels be switched back on, in place of Ukrainian-language services. In a separate development on Sunday, pro-Russian gunmen said they had captured three Ukrainian security services  members overnight in eastern Ukraine. Kiev later confirmed a number of its officers had been seized. This comes as the US and EU are preparing new sanctions against Russia, accusing it of destabilising Ukraine. US President Barack Obama said the Kremlin had "not lifted a finger" to implement last week's deal in Geneva aimed at easing the crisis. EU diplomats are expected to meet on Monday to discuss fresh sanctions against Russia. The Kremlin denies supporting the militia in eastern Ukraine.(FA)