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Russian troops are advancing on Ukraine's capital from several directions after Russia's President Vladimir Putin ordered the invasion.

Putin has cited many different reasons for invading Ukraine, from historical and cultural links to "de-Nazifying" Ukraine's current leadership.

For many experts, the question now is how far will Russia go?

Keir Giles is a senior consulting fellow of the Russia and Eurasia Programme at Chatham House. He outlines his understanding of Putin's objectives.

Photo: Russian army military vehicles
Credit: Getty Images