Renewed fighting has reportedly broken out in the eastern Ukrainian city of Donetsk.

Ukraine's military says it came under fire from pro-Russian rebels in Donetsk airport this morning, despite a ceasefire that came into effect last week.

So far, there are no reports of any injuries.

There are also reports that Moscow has sent a second convoy of trucks into Ukraine without Kiev's consent.

Earlier this week, the 'shaky' ceasefire was said to have been holding despite sporadic violations.

Before the ceasefire was agreed in Minsk late last week, Russian-backed separatists had been advancing on Donetsk airport and Mariupol - a key city between Russia and Crimea, which Moscow annexed in March.

The five-month conflict has resulted in the deaths of more than 3,000 people, according to the UN.