Russia's plans to host naval exercises off Ireland's coast are a threat to rare marine wildlife, the country's ambassador in Dublin has been warned.
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In a letter to Yury Filatov, Irish junior minister Malcolm Noonan said the planned military exercises are "deeply concerning".
Mr Noonan said the impact on a number of species could be "devastating".
The naval exercises are due to take place about 240km (150 miles) off the south-west coast of Ireland next month.
Mr Noonan said while the exact nature of the planned exercises is unknown, underwater sounds such as military sonar "can have devastating consequences" for a number of species, including sperm, beaked and "the deep-diving and rarely-seen blue whale".
The Republic of Ireland's defence minister, Simon Coveney, has said the live-fire exercise was "not welcome", but the country had no power to stop it.
Sonar can cause significant disruption to the mammals' hearing and can "lead to permanent or even lethal injury," Mr Noonan added.
He has also written to Mr Coveney, who holds both the Irish foreign and defence ministerial briefs, expressing his concerns.
The proposed exercise also comes amid rising tensions over a build-up of Russia's military forces on the Ukraine border.