Crisis over the MH17 atrocity

Russia and the west have been increasingly at odds following the shooting down of a Malaysian Airlines flight over Ukraine, an atrocity that has been widely blamed on pro-Russian separatists. What are Vladimir Putin’s options, and what diplomatic accommodation be can be found to make the situation less volatile?
Katherine Hille, Moscow bureau chief, and Neil Buckley, east Europe editor, join Gideon Rachman.