All leave is cancelled for Irish troops deployed to Lebanon and Syria.
The two states have closed their borders to travellers from countries affected by Covid-19, which now includes Ireland.
Over 500 troops are involved in peacekeeping efforts across two UN missions.
Personnel serving in UNIFIL & UNDOF confirm that, due to #COVID19, leave for the immediate future is cancelled. We acknowledge the disappointment of families & loved ones due to this. For more information click https://t.co/FtNE0W5CiC #óglaighnahéireann #Military @UNPeacekeeping pic.twitter.com/kfeTSZPfKo— Óglaigh na hÉireann (@defenceforces) March 14, 2020
Gerard Guinan, general secretary of representative group PDFORRA, says the move is "desperately unfortunate" for the soldiers and their families.
"When you are there, you have a job to do and your thoughts will be with your family but you have to focus on the situation at hand," he said.
This is the life of a soldier, we have a very difficult job at the best of times but we are professionals.