Russian intelligence ship located in Irish-controlled waters not responding to communication

"A Russian Navy intelligence-gathering ship is being tracked through Irish-controlled waters

and is refusing to respond to communications from the Naval Service.
The Viktor Leonov, a 100m vessel from the Russian Navy’s Northern Fleet, was spotted by the Irish Naval Service earlier this week. It is being tracked by LÉ Samuel Beckett as it sails through the Irish Exclusive Economic Zone (EEZ).
Defence sources said the Beckett has attempted to hail the Leonov and establish its purpose in Irish-controlled waters.
The Russian ship has acknowledged receiving the communication but has refused to communicate further. It is believed the ship’s eventual destination is Cuba." IrishTimes