Ukraine on Monday showed two prisoners it said were Russian soldiers who had killed Ukrainian troops in fighting in its east and said they would be prosecuted for "terrorist acts."

The Ukrainians seized on the capture of the two Russians, both wounded, to support their accusations of direct Russian involvement in the separatist conflict despite a cease-fire signed in February. Russia denies active military involvement.

In a video posted online by the Ukrainian interior ministry, one of the prisoners gave his name as Alexander Alexandrov. He said he had been on a spying mission in Ukraine as part of a 14-member special forces group from the Russian town of Togliatti.