Russia 'to help free Ukraine group'
Moscow says it will do all it can to bring about the release of European military observers detained in eastern Ukraine by pro-Russian separatists.
The assurance came as EU diplomats revealed they will meet on Monday to discuss new sanctions against Russia.
Earlier, the G7 group of economic powers agreed to intensify sanctions.
The West accuses Russia of leading a secessionist revolt in Ukraine's east, after it annexed Crimea last month. Moscow denies the allegations.
Steve Rosenberg reports from Sloviansk.
- From the section Europe