Cars pass an empty pro-Russian checkpoint after heavy fighting between pro-Russian fighters and Ukrainian government troops outside Slovyansk, eastern Ukraine. (AP Photo/Evgeniy Maloletka)

Moscow - Russia protested to Kiev on Thursday, saying a Russian checkpoint on the border with Ukraine was fired on by the Ukrainian military, which is fighting separatists in the east of the country.

“The Russian side expresses its strong protest and demands an end to the shelling of Russian territory,” the Foreign Ministry said in a statement, saying it was not the first time the border post at Gukovo had come under fire.