On Wednesday, Irish Prime Minister Micheál Martin traveled to Kyiv, where he met Ukrainian President Volodymyr Zelensky. Martin said Ireland stands ready to support Ukraine’s postwar reconstruction — and to help hold Russia accountable.

Prime Minister Micheál Martin: “The use of terror against and the deliberate targeting of civilian populations are war crimes. Those responsible, those carrying out these actions and those directing them, will be held fully accountable, and there will be no hiding places.”

In response, former Russian President Dmitry Medvedev warned the U.S. and its allies could face nuclear retaliation if they pursue an international tribunal to investigate Russian war crimes committed in Ukraine. Medvedev wrote on social media, “The idea of punishing a country that has one of the largest nuclear potentials is absurd. And potentially poses a threat to the existence of humanity.”