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© RIA Novosti/ Max Vetrov
Foreigners are taking part along with Ukrainian forces in special operations in the southeastern city of Slavyansk, a representative from the city's self-defense movement told RIA Novosti Friday.

"When using radios, activists have heard English several times on the air," the activist said. According to the activist, this is "direct proof of the participation of foreigners in the retaliatory operations against Slavyansk."

Russia's Ministry of Foreign Affairs has repeatedly voiced its concerns about the involvement of agents from Greystone private security firm into Ukraine's crisis, as well as about the buildup of foreign forces in Ukraine.

Last month Moscow said it had reports that some 150 of agents from Greystone mercenaries were implicated in a crackdown on protesters in eastern Ukraine.

"There were reports, as you know, that some several hundreds of [agents from] the private military organization called Greystone were detected to arrive in Ukraine from the US. We'd like this also to be investigated," Russia's Foreign Minister Sergei Lavrov said in an interview with RT TV channel last week. "We raised this [question] with the American colleagues. They said they had no knowledge of this going on and they said they had approached the organization itself ' Greystone ' and they denied this. We would like to really be certain of who is doing what because there have been so many 'distortions of reality,'" he added.

Greystone Ltd. however denied reports of sending its personnel to Ukraine.

"While Greystone has the ability to deploy world-class security staff and trainers anywhere in the world, the Company does not currently, nor do we have any plans to, send personnel to the Ukraine," Greystone media advisor Tiffany Anderson told RIA Novosti last month.

"The reports about the foreign mercenaries involvement in this operation once again raises a grave issue of external interference in Ukrainian affairs and the role of the West in provoking this situation instead of sending the necessary limiting signals to the Kiev authorities, instead of encouraging them to rein in all those unbridled extremists and radical nationalists," Konstantin Dolgov, the Russian Foreign Ministry Commissioner for Human Rights, told RIA Novosti Tuesday.