Ukraine just banned Russian men from entering the country.

Ukranian President Petro Poroshenko confirmed that restrictions have been imposed on Russian men between the ages 16 and 60 in order to prevent the formation of “private armies which in reality are representatives of Russian armed forces.”

The Russian Foreign Ministry spokeswoman Maria Zakharova told the press that Russia wouldn’t return such restrictions on Ukranian men.

The restrictions have been imposed by Poroshenko according to the Martial law, which is a that allows him to impose restrictions on both the internal and external affairs of the country.

The restriction returns to the fact that Ukraine has a lost territory with Russia (Crimea) between the Black Sea and the Sea of Azov, which caused a lot of conflict between the two countries for many years.