Ireland is under fire over its continued sales of alumina to Russia, raising concerns that the country might be indirectly helping Moscow fuel its war machine against Ukraine.

Sold as white powder, alumina is the raw material used to produce aluminium, a lightweight metal commonly found in weapons and ammunition on the battlefield.

The timing of the revelations is particularly sensitive for Dublin, which is less than one month away from taking the reins of the EU Council's six-month presidency.

High Representative Kaja Kallas intends to raise the matter when she meets with Irish Prime Minister Micheál Martin in Dublin on Tuesday.

"We should be more creative in finding ways how we can actually stop this war," Kallas said on Monday during a ministerial meeting in Cyprus.