What exactly does Putin want in Ukraine?

Tensions in Europe have run high in recent weeks on Western fears Russia may invade neighboring Ukraine, which Moscow denied is its intention. President Vladimir Putin has said some of its troops were returning to base after exercises near Ukraine and that his country does not want a war in Europe. But why has Russia amassed thousands of troops and weapons at its borders? The Guardian’s Moscow correspondent Andrew Roth looks at what Putin wants in Ukraine – and why now.