KIEV, July 15 - Ukraine has made fresh charges of Russian involvement in its conflict with separatist rebels, suggesting Moscow may have had a role in an air strike on Tuesday that killed 11 people, Reuters reported.

Pushing hard for the EU - Ukraine's new strategic partner - to take tougher measures against Russia at its Brussels summit on Wednesday, Kiev pointed to the downing of an An-26 military transport plane on Monday and Tuesday's air strike on the Ukraine town of Snizhne.

The town's health authorities said 11 people were killed and eight others injured, including a child, in the attack, which hit a residential area of Snizhne, 20 kilometers from the border with Russia, destroying 12 apartments.

A separatist leader was quoted by Russia's Interfax news as saying the attack had been the work of a Ukrainian warplane.

But military officials and the foreign ministry said no Ukrainian fighter planes had taken off since Monday because a search and rescue operation was underway in the area for survivors of the downed An-26.