Ukraine's acting President Oleksander Turchynov is not ruling out a national referendum on territorial integrity along with the presidential elections in Ukraine, Ukrinform reports.

In televised comments this morning, Turchynov said a referendum could be held at the same time as presidential elections scheduled for May 25.

Turchynov said he was sure the majority of Ukrainians would back a united, independent country.

In Moscow, Russian Foreign Minister Sergei Lavrov said more information was needed on the referendum mooted in Kyiv.

The holding of such a referendum has been one of the key demands of pro-Russia separatists who have occupied state buildings in the east of the country.