Ukrainian helicopter crashed near the Ukrainian border, in the east of Slovakia, reported Noviny.sk citing the law enforcement agencies.
Currently, law enforcement officers suggest these were either Ukrainian military or smugglers.
In the past few days the weather conditions in this region deteriorated, the pilot could underestimate them, according to Aktuality.sk.
The helicopter crashed 35 km from the city of Uzhgorod, and fell into the water reservoir Zemplínska Šírava.
Due to the accident the Slovak Interior Minister Robert Kalinyak announced an emergency briefing.