This was announced by the State Border Service's press office, Censor.NET informs citing Dumskaya.
Additional security measures have been adopted "for the case of possible situation aggravation."
Yesterday, ships, boats and aviation of Ukraine's Navy and State Border Service were maneuvering near the island.
In addition, a unit of marine infantry of the Armed Forces of Ukraine, equipped with heavy weapons, have made landing on Zmiinyi island and will remain there until the situation is stable.
"Training is held daily. You get used to it. Sometimes you even like grating sand on your teeth," - anti-tank units of Ukraine's Armed Forces exercised in Chernihiv region. VIDEO(0)