Live updates: 20 babies from surrogate moms in bomb shelter

Researchers tracking only those Russian equipment losses that were photographed or recorded on video say Russia has lost more than 1,500 tanks, trucks, mounted equipment and other heavy gear. Two out of three of those were captured or abandoned, signaling the failings of the Russian troops that let them go.

When it comes to the grinding job of capturing and holding cities, conventional military metrics suggest Russia needs a 5-to-1 advantage in urban fighting, analysts say. Meanwhile, the formula for ruling a restive territory in the face of armed opposition is 20 fighters for every 1,000 people — or 800,000 Russian troops for Ukraine’s more than 40 million people, said Michael Clarke, former head of the British-based Royal United Services Institute, a defense think tank

That’s almost as many as Russia’s entire active-duty military of 900,000, and it means controlling substantial Ukrainian territory long term could take more resources than Russia can commit, he said.

“Unless the Russians intend to be completely genocidal — they could flatten all the major cities, and Ukrainians will rise up against Russian occupation — there will be just constant guerrilla war,” said Clarke.

MARIUPOL — Evacuations from Ukraine’s besieged cities proceeded Saturday along eight of 10 humanitarian corridors, Deputy Prime Minister Iryna Vereshchuk said, with a total of 6,623 people were evacuated, including 4,128 from Mariupol who were taken northwest to Zaporizhzhia.