Russia is reinforcing its border with Ukraine at a section bordering separate areas of Donetsk and Luhansk regions (ORDLO) uncontrolled by the government to prevent militants from getting into their territory, Head of the State Border Service of Ukraine Petro Tsyhykal said.

In an interview with Channel 5 on Friday evening, when asked whether the information that Russia has strengthened this section of the border in order to prevent the passage of criminal gangs into its territory is true, Tsyhykal said: "Yes. The fact has been confirmed by different sources."

The State Border Service chief added: "This is an appropriate signal for us that not everything is so good for them."