Ukrainian law enforcement agencies have opened criminal investigations under two articles of Ukraine's Criminal Code after Russian officers from the Joint Center for Control and Coordination (JCCC) were found in possession of methodical materials of a military nature, as well as symbols of illegal armed units

"On February 2 of this year, our investigation registered a criminal case opened under Article 333 of the Penal Code of Ukraine – a violation of the rules for transporting commodities subject to state control, as well as under Article 258, Point 3 – abetment to terrorist activity," Ukrainian Security Service chief Vasyl Hrytsak told a press briefing in Kyiv on Tuesday.

As a correspondent of Interfax-Ukraine reported, the SBU chief said that in a course of the regular rotation of the Russian JCCC mission on January 27, during a border control procedure of the Russian servicemen – Commander Sergey Kutsenko and Major Alexander Kornik were found 14 manuals on military matters with a secrecy label of 'restricted use', including a manual on using of the volley fire, methodical materials and a course of lectures concerning the application of modern tank units under special conditions using hand grenades and mines.

Besides, the SBU demonstrated symbols of the illegal armed formations that work in Donbas, including symbols and flags seized from the Russian servicemen.

He said all the materials seized would be attached to the materials of the criminal case.

"As for today we have a firm belief and we show you that in fact what the officers of the Russian army declare and what they really do somehow differs," Hrytsak said.