New Delhi, Jan. 29 -- The number of soldiers killed, injured or missing on both sides of Russia's war on Ukraine could be 2 million by spring, with Russia sustaining the largest number of troop deaths for any major power in any conflict since World War II, a report warned Tuesday.

The report from the Center for Strategic and International Studies came less than a month before the fourth anniversary of Moscow's full-scale invasion of Ukraine on Feb. 24.

As the war grinds through another bitterly cold winter, Russian strikes damaged an apartment block Wednesday on the outskirts of Kyiv, killing two people. Nine others were injured in attacks in the Ukrainian cities of Odesa and Kryvyi Rih and in the front-line Zaporizhzhia region.

The CS...