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Alexander Ward And Lara SeligmanPolitico |
The report comes as Defense Secretary Lloyd Austin prepares to face lawmakers on Thursday to discuss his handling of his medical problems.
The Department of Defense also withheld the information from senior DOD officials and lawmakers.
The U.S. assesses that more than 13,000 Russian soldiers have been killed in a key eastern Ukrainian battleground since October.
"Everything we've done — the additional forces, the messaging — is intended to prevent escalation," one U.S. official said.