say they have
seized the airport. A truce agreed in eastern Ukraine on 5 September looks increasingly fragile.

On Friday US Secretary of State John Kerry spoke on the phone
with his Russian counterpart Sergei Lavrov to "express his concern
about intensifying violence in eastern Ukraine". "Russia must use its influence with the separatists and end
these attacks immediately", state department spokeswoman Jen Psaki said.

"The situation in the area of Donetsk airport remains difficult,"
Ukrainian military spokesman Vladyslav Seleznyov told Ukraine's Kanal 5
TV.

"The militants, using smoke bombs as a cover, broke into the ground floor of the old terminal," he said.

Ukrainian soldiers had pushed the rebels from half the building, Mr Seleznyov added.But leaders of the self-proclaimed Donetsk People's Republic claimed that their fighters had seized the whole airport. Eyewitnesses earlier told local mediathat a number of rebels had been killed during the clashes. A correspondent for Associated Press news agency reported
seeing three rebel tanks firing at the main terminal, with sniper shots
ringing out.

Fighting for the airport - a vantage point for the Ukrainian army to
fire on positions in rebel-held Donetsk - has intensified in recent
days. Ukraine says two servicemen have been killed and another nine
wounded since Thursday. Mr Seleznyov also accused Russia of sending drones over the airport to help the rebels' reconnaissance efforts and direct fire. Russia has denied sending arms to the rebels or soldiers to
eastern Ukraine, though it says "volunteers" have crossed into Ukraine. Earlier, the International Committee of the Red Cross (ICRC)
condemned indiscriminate shelling in east Ukraine after a Red Cross
employee was killed. Swiss citizen Laurent