Seven leading humanitarian agencies have come together to respond faster to the growing crisis in Ukraine following Russia's invasion.
The Irish Emergency Alliance says it is working with local partners in Ukraine and neighbouring countries of Poland, Hungary, Romania and Slovakia.
It is helping those who have fled the conflict by providing food, shelter, blankets, medical supplies and emotional support.
Its member organisations are made up of: Action Aid, Christian Aid, Plan International, Self Help Africa, Tearfund, Trócaire and World Vision Ireland.
Trócaire CEO Caoimhe De Barra told Newstalk Breakfast more people will need help in the coming days.
"Over the past week, more than a million people have fled Ukraine to escape the conflict.
"And what we have seen is predictions that up to four million more will flee across borders, and 6.7 million might be displaced within Ukraine.
"All of these people are in desperate and urgent need of what we can provide: food, water, blankets, shelter, medical supplies, as well as psychological support.
"We are seven of Ireland's most experienced and prominent humanitarian NGOs, and we are pooling our resources.
"We can have huge impact by working together, and we can respond at-scale to the needs of the many people who need our support".
People can donate at irishemergencyalliance.org, by calling 1800-939-979 or texting 'IEA' to 50300.
"Any donation, no matter how large or small, will be very welcome and will be very well used", Ms De Barra adds.
While Dóchas, the Association of Irish Development NGOs, says it is "gravely concerned" about the conflict in Ukraine, and denounces Russia's attacks on Ukrainian territory.
CEO of Dóchas, Jane-Ann McKenna, says: "As the conflict in Ukraine intensifies and the number of people displaced reaches one million, the need for urgent humanitarian assistance is growing by the hour.
"Irish organisations are working on the ground, in Ukraine and border countries, including Poland and Romania, supporting families fleeing the conflict, and responding to their immediate needs.
"Irish people have shown great generosity and solidarity with the people of Ukraine.
"We encourage people to provide donations to organisations who are working on the ground with emergency response teams in the Ukraine or in border countries.
"Donating money, rather than physical items, allows organisations to source relief items locally, ensuring quality and quick delivery to those who need them", she adds.