A general view of the Dublin city skyline in 2017. Stephen McCarthy/Sportsfile/Getty Images

Investigations are underway in Ireland and France after two more incidents this week involving unidentified drones flying close to the coastlines of each country.

On Monday night, several drones were seen flying off the coast of Dublin, just as the plane carrying Ukrainian President Volodymyr Zelensky was about to land ahead of his first official visit to Ireland.

On Thursday night, several drones flew close to a French naval base on the Atlantic coast housing nuclear ballistic missile submarines, French prosecutors told local media.

The two incidents are the latest in a string of unexplained sightings in several European countries since September. Some drones have disrupted civilian air t

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