The United States and the European Union plan to impose stiff new sanctions against Russia in retaliation for its “war crimes” in Ukraine after revelations of atrocities in towns near Kyiv, including the discovery Tuesday of six burned and blackened corpses.

The new penalties by the U.S. and its allies, which will be announced Wednesday, include a ban on new investment in Russia and are intended in part to “impose acute and immediate economic harm on Russia.”

The European Union’s executive branch on Tuesday proposed a ban on coal imports from Russia, in what would be the first sanctions targeting Moscow’s lucrative energy income for its war in Ukraine. The coal imports amount to an estimated 4 billion euros ($4.4 billion) per year.

“Today we are proposing a 5th package of sanctions. To take a clear stand is crucial for the whole world,” the E.U. Commission said in a Twitter post. “A clear stand against Putin’s war of choice. Against the massacre of civilians.”

The news comes after Ukrainian President Volodymyr Zelenskyy told the U.N. Security Council earlier Tuesday that the U.N. must bring war crimes charges against Russian leaders.

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Latest developments

►Russian troops allowed 1,496 civilians to evacuate the besieged city of Mariupol by private vehicle but blocked the entry of a convoy of evacuation buses accompanied by Red Cross workers, Ukrainian Deputy Prime Minister Iryna Vereshchuk said.

►Ukraine President Volodymyr Zelenskyy drew parallels between the Russian attacks on Ukrainian cities and the 1937 bombing of the Basque town of Guernica by Nazi aircraft during the Spanish Civil War as he urged Spanish companies to cease all business with Russia in a video address to the Spanish Parliament.

►French Finance Minister Bruno Le Maire said Tuesday there is a “total determination” from all 27 E.U. countries for more severe sanctions targeting oil and coal. Europe’s dependence on Russian oil, natural gas and coal had left energy sanctions off the table amid fears the entire continent could plunge into recession.