Josep Borrell Fontelles, the European Union’s top foreign policy official, said in a statement that every day Russia’s continued “illegitimate and unjustified war of aggression” brought “further horrific atrocities,” adding that the “inhumane, barbaric acts” breached the Geneva Conventions and amounted to war crimes.
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Kaja Kallas, the prime minister of Estonia, a Baltic country that has been among Moscow’s toughest antagonists over the war, said Russia was responsible for the “mass murder” of prisoners at the camp, an act that she said called to mind “the darkest chapters of history.”
“There must be no impunity for war crimes, just like there can be no return to relations with war criminals,” she said in a statement.
For Mr. Zelensky, the prison explosion fits a pattern in which an unwarranted invasion of his country, ordered by President Vladimir V. Putin of Russia, has been accompanied by atrocities committed by Russian forces, for example in suburbs north of the capital, Kyiv, and missile strikes on civilian targets, including one this month at a shopping mall in the center of the country far from the front lines.