U.S. says up to 4,000 Russian soldiers have died in Ukraine invasion
https://www.nbcnews.com/politics/national-security/us-intel-agencies-russia-not-want-engage-directly-us-military-rcna19128
"Moscow underestimated the strength of Ukraine’s resistance," a top intel official said, but Putin may feel compelled to fight on with "reckless disregard" for civilians.
