Self-defense forces repel Ukrainian air attacks east of Donetsk
"We have been attacked by three Su-25 fighter bombers. They came three times and fired four guided heavy missiles plus NURS [unguided missiles]. We are responding with anti-aircraft fire," a spokesman for self-defense forces told reporters.
Ukrainian aircraft have also bombed the nearby village of Tarany controlled by self-defense forces.
Earlier, Ukraine's National Security and Defense Council confirmed Ukrainian air strikes in the area of military operations.
Large numbers of Ukrainian troops trapped near Saur Mogila are reportedly attempting to fight their way out of the encirclement.
In April, Kiev launched a military operation to suppress anti-government moods in eastern Ukraine in the wake of the Maidan-led February coup that ousted President Viktor Yanukovych.
Russia has repeatedly called for an end to bloodshed in eastern Ukraine.