KIEV, November 30. /TASS/.The Ukrainian State Border Guard Service has prohibited Russian men, aged 16-60, from entering the country, its head Pyotr Tsigikal said on Friday.

"Control measures at checkpoints have been enhanced. As of today, foreigners, primarily Russians, have been restricted entry. Russian men, aged 16-60, have been prohibited from entering (Ukraine)," he stated at a council with Ukrainian President Pyotr Poroshenko.

The chief of the State Border Guard Service pointed out that entry is only possible should the situation a "humanitarian nature" emerge, like funerals, for example.

The Russian Federal Security Service (FSB) reported on November 25 that the Ukrainian warships, the Berdyansk, the Nikopol and the Yany Kapu had breached the Russian state border on Sunday morning and later attempted to carry out illegal maneuvers in Russia’s territorial waters later. The Ukrainian vessels ignored the legitimate demands of the Coast Guard of the FSB Border Service and the Black Sea Fleet to immediately halt, and end performing dangerous maneuvers. As a result of blatantly disregarding the orders, a chase involving some gunfire ensued in order to stop the Ukrainian ships, which were detained in Russian territorial waters.

Moscow branded Kiev’s stunt in the Kerch Strait as a dangerous provocation, while the European Union and NATO called for a de-escalation of tensions.

On Wednesday, Crimean courts imposed two-month pre-trial detentions on all 24 Ukrainian sailors, who are suspected of breaching the Russian state border (part 3, Article 322 of the Russian Criminal Code). They may face up to six years in prison.