Ukrainian border guards have begun checks on a convoy of Russian trucks carrying aid supplies to the east of the country, the border guards service said.
Spokesman Andriy Demchenko told Reuters: "I can confirm that the Ukrainian side began border-customs formalities relating to the Russian humanitarian cargo."
But he said that at this point the cargo was still in Russian territory.
More top news
A rollercoaster has come off the rails at a theme park in Scotland, leaving nine children and two adults in hospital.
"I saw a lot of smoke come out from the tail-end of the aircraft. I wondered if it was normal, whether it was just exhaust fumes."
The House of Commons Petitions Committee has said they will keep an eye on the petition and are concerned about fraudulent signatures.