International monitors deployed along the Russian border in eastern Ukraine say their drones were shot at and jammed days before new columns of unmarked soldiers and weapons, said by the West to be Russian, were seen in the rebel-held territory this week.

The reports by the Organisation for Security and Cooperation in Europe (OSCE), which is seen as a neutral party in the conflict that has killed more than 4,000 people, come as Kiev and Moscow trade accusations of violating a fragile ceasefire.

But Western officials say the rebels are behind the incidents, and Kiev says the rebels have intentionally hampered OSCE monitoring efforts to cover up the arrival of new Russian reinforcements of soldiers and weapons in eastern Ukraine.

“The fact that the separatists are jamming the drones or shooting at them to some people is evidence that they have something to hide,” said US Ambassador to the OSCE Daniel Baer. Russia denies sending weapons and soldiers to eastern Ukraine and says the reports are part of an information war against the Kremlin.

A 50-vehicle column armed with rocket launchers and artillery guns seen travelling towards Donetsk from Russian border

In its reports, the OSCE did not say who carried out the jamming. Ukraine denied involvement while a rebel commander, Eduard Basurin, said it was unclear who had shot at the drones.

Pro-Russian rebels have controlled large swathes of the border between Russia and Ukraine since the start of the conflict.

On November 3, the OSCE said one of its drones was jammed by military grade equipment near the town of Chermalyk in southeastern Ukraine, 30 kilometres from the border. A day earlier, another drone was shot with an anti-aircraft gun by a man in camouflage while it was flying over a separatist checkpoint 20 kilometres east of the port of Mariupol.

“The militants are simply shooting at the drones, which are trying to monitor the situation on the border and areas of fighting. The militants are not interested in the world knowing the truth,” said Vladislav Seleznyov, spokesman for Ukraine’s military operations in the east.

“Putin says there are no Russian troops in Ukraine, but it’s not true,” he told Reuters by telephone.

Reuters saw a 50-vehicle column armed with rocket launchers and artillery guns travelling towards the rebel stronghold of Donetsk in eastern Ukraine from the direction of the Russian border on Tuesday.

Sign up to our free newsletters

Get the best updates straight to your inbox:
Please select at least one mailing list.

You can unsubscribe at any time by clicking the link in the footer of our emails. We use Mailchimp as our marketing platform. By subscribing, you acknowledge that your information will be transferred to Mailchimp for processing.