vladimir puton's brutal siege of the city of mariup the mariapol in southern ucraine. The town is positioned almost like a bridge between two ukranian territories that russia already occupies. In two thousand and 14 when russia invaded those territories, it wanted to take mariupol too. But the ucranian forces did beat back the russians and secured the town - something some believe puten never really forgave. And international law expert tries to determine the price that puton should pay.