<sod >Ukraine has launched an âanti-terrorâ operation against armed gunmen who have seized police buildings in the eastern city of Slovyansk, issuing a warning for members of the public to keep clear.< eod>< sod > Earlier, Mr Avakov said his forces would be launching what he described as an âanti-terrorâ operation against the 10 gunmen, issuing a warning for members of the public to keep clear.< eod>