KIEV, August 13. /ITAR-TASS/. The Ukrainian army has lost 11 servicemen in its military operation in the country’s east in the past 24 hours and another 41 have been wounded, spokesman for Ukraine’s National Security and Defense Council Andriy Lysenko said on Wednesday.

The Ukrainian National Security Council currently has no clear information about an incident near Donetsk with members of Ukraine’s Right Sector nationalist movement, Lysenko said.

Right Sector leader Dmitry Yarosh claimed on Facebook on Wednesday that the movement’s members had been killed near Donetsk after their bus had been shelled by local self-defense militia.

The National Security Council spokesman said it was inappropriate to talk about casualties among Right Sector fighters as the people shelled near Donetsk were from a regional defense battalion.

Ukraine’s National Security and Defense Council earlier reported that 568 servicemen had been killed and another 2,120 wounded as of August 11 in Kiev’s military operation in the country’s east.

Ukraine’s Prime Minister Arseniy Yatsenyuk earlier said that there were about 50,000 Ukrainian troops in the conflict area.

Donetsk media earlier reported that self-defense fighters had opened fire on a bus full of Right Sector gunmen at the entrance to the city, killing 12 nationalists.

Pro-Kiev troops and local militias in the eastern Ukrainian Donetsk and Luhansk regions are involved in fierce clashes as the Ukrainian armed forces are conducting a military operation to regain control over the breakaway regions, which on May 11 proclaimed their independence at local referendums.

During the military operation, Kiev has used armored vehicles, heavy artillery and attack aviation. Many buildings have been destroyed and tens of thousands of people have had to flee Ukraine’s embattled east.