According to the Ukrainian government, around eight hundred Russian soldiers have been killed, according to the Week:

Ukraine’s Defense Ministry said early Friday that since Russian invaded the country Thursday morning, Ukrainian forces have inflicted about 800 casualties on Russian forces (perhaps including wounded soldiers), destroyed more than 30 Russian tanks, seven Russian aircraft, and six helicopters, CNN reports, noting that it is “not able to independently verify Ukraine’s figures.”

The ministry claimed later Friday morning that Ukrainian air defenses had stopped “two deadly presents from our ‘brothers'” from hitting Kyiv, and said Ukrainian forces had destroyed a bridge over the Teteriv river to keep approaching Russian armored units from reaching the embattled capital. Ukraine’s Ukrayinska Pravda newspaper confirmed the bridge’s destruction.