Russia wanted a quick victory in Ukraine, but it hasn't succeeded.

Instead, it's withdrawing its troops from key cities, leaving in their wake shocking evidence of torture and war crimes.

It's not the end of the war: It's widely thought the Kremlin will now focus on taking control of other parts of the country.

Today, former US Army Major John Spencer, who was part of the advance group that captured Baghdad from Saddam Hussein in 2003, on why Russia has failed so far, and what comes next for Ukraine's terrified civilians.

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John Spencer, retired US Army major and former Chair, Urban Warfare Studies, Modern War Institute, US Military Academy, West Point, New York