Ukraine accused Russian forces yesterday of helping separatists step up pressure on government troops holding the main airport in the eastern city of Donetsk, threatening a fragile ceasefire.

Military spokesman Andriy Lysenko said Ukrainian forces had repelled several separatist attacks on the airport in the past 24 hours but “non-stop fighting” continued and “significant numbers of armour, heavy artillery and troops” had moved into the area.

“The Russians have sent in a full unit of drones over the airport, directed by Russian specialists, in order to carry out air recon­naissance and to direct fire,” he told journalists.

Mortar and artillery fire has increased between separatists and government troops in rebel-controlled Donetsk, the east’s main industrial hub, in recent days after a lull last week.

The Russians have sent in a full unit of drones over the airport

A Swiss Red Cross worker was killed on Thursday night by a mortar bomb that landed near the organisation’s office in the city.

Seven Ukrainian soldiers died in a single strike by tank fire on their armoured personnel transporter on Monday and at least 10 people were killed when shelling hit a school playground in Donetsk and a public transit mini-van in a street nearby on Wednesday. Each side has blamed the other for the attacks. Government forces say they are observing the ceasefire and returning fire only when they are fired on.

Ukrainian Foreign Minister Pavel Klimkin said that separatists had been responsible for the death of Red Cross worker Laurent DuPasquier, but the Russian Foreign Ministry in a statement yesterday said the mortar bomb fire that killed him had come from territory controlled by Ukrainian forces.

Two Ukrainian servicemen had been killed and nine others had been wounded in the past 24 hours, Lysenko said.

Lysenko said that government forces still had control of the airport, a strategic point with modernised runways able to take heavy transporter planes. Defences had been strengthened.

Lysenko also said that in the south of Ukraine, on the coast of the Sea of Azov, Ukrainian intelligence had also reported that more Russian armour and a Russian reconnaissance unit had moved in near the town of Mariupol.

Mariupol, which is defended by Kiev government forces, is of strategic importance since its loss could help open up a route for Russian-backed forces to the Crimean peninsula, which was annexed by Russia in March.

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