Nearly 1 million Russian soldiers have been killed or injured in the country’s full-scale invasion of Ukraine, according to a new study, a grisly measure of the human cost of Russian President’s Vladimir Putin’s unprovoked three-year assault on its neighbor.

A serviceman from the mobile air defence unit of the 115th Separate Mechanized Brigade of the Ukrainian Armed Forces fires a Browning machine gun towards a Russian drone during an overnight shift, amid Russia's attack on Ukraine,

Russia’s invasion force is expected to suffer more than 1 million casualties by the summer as a result of the Ukraine war, with around 250,000 troops already confirmed dead, according to a new study.