(QHA) -

Ukraine says it has closed at leats 8 border crossings with Russia after heavy fighting with pro-Russian insurgents.

The Border Guard Service said on June 5 that the posts in the eastern Luhansk region were "closed" and border guards had withdrawn because of the "extreme escalation" in the security situation.

"After an exchange of fire, the threat to the lives of people crossing the border prompted the evacuation of civilians and borderguards at the checkpoints," the border guards said in a statement.

Border guards have frequently clashed with the separatists who on June 2 attacked their headquarters in Luhansk.

Ukraine's government says fighters are crossing over from Russia.

Russian Foreign Ministry spokesman Aleksandr Lukashevich said on June 5 Ukraine's plans to close the border were "outrageous and inadmissible."