Surpassing 1 million people killed and wounded would be “a stunning and grizzly milestone,” according to a report by a prominent Washington think tank.

Russia will likely surpass 1 million casualties in its war on Ukraine this summer, according to one of the world’s leading think tanks, reflecting the staggering human toll of President Vladimir Putin’s assault on his neighbor.

Around 250,000 of these Russian soldiers have died, the Washington-based Center for Strategic and International Studies said in a report Tuesday.

Ukraine has also suffered heavy losses, with 400,000 casualties including between 60,000 and 100,000 killed, it said.