Russia-Ukraine crisis: Why does Vladimir Putin want to invade Donetsk and Luhansk?

Professor Michael Clarke, former director general of the Royal United Services Institute (RUSI) and security analyst, explains: "Those breakaway areas claim the whole of Donetsk and Luhansk, but they physically only control around a third of them." Neither people's republic is recognised by any country apart from Russia, which this week recognised them as independent from Ukraine and signed friendship treaties with both of them.