U.K. intelligence officials said Moscow's "unprofessional" military practices were likely partly to blame for the high casualty rate on the troops.
Moscow has admitted that a Ukrainian attack using U.S.-made weapons killed dozens of its troops in the occupied Donbass region, and Putin is expected to seek retaliation.
Will Russia launch a winter offensive in Ukraine russiaherald.com - get the latest breaking news, showbiz & celebrity photos, sport news & rumours, viral videos and top stories from russiaherald.com Daily Mail and Mail on Sunday newspapers.
President Volodymyr Zelensky visits Washington on Wednesday with the US announcing it will send Ukraine Patriot missiles. The announcement looks like a response to Ukrainian fears of a Russian winter…