Pro-Russian separatists on Saturday launched missile attacks on the southeastern Ukrainian city of Mariupol, killing 30 civilians and injuring more than 100.
"This is a crime against humanity to be tried by the Hague tribunal," Ukrainian President Petro Poroshenko said in a statement.
Rebels fired around 60 missiles in two separate attacks, with the scope of the bombardment suggesting, according to Western officials, some degree of Russian involvement. Secretary of State John Kerry called the attack "reprehensible" adding that it was "aided and abetted by Russia’s irresponsible and dangerous decision to resupply" the rebels despite a delicate truce.
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Moscow denied any role in the attack.
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