The Taoiseach says it's "preposterous" for Russia to claim the deaths of civilians in a town near Kyiv were staged.
Ukraine's President says more than 300 people were killed and tortured by Russian forces in Bucha - calling it a war crime.
The Russian Embassy in Ireland has said the images were staged and part of a "disinformation campaign" against Moscow.
Taoiseach Micheal Martin has dismissed those suggestions.
"I think that's a preposterous position that the Russian ambassador has put forward and indeed that the Russian Federation is putting forward.
"We are increasingly hearing of accounts from independent observers in relation to the barbaric nature of this war and particularly the indiscriminate murder of civilians."
