Prime Minister Abbott made headlines this week with his promise to 'shirtfront' Vladimir Putin when he arrives in Brisbane next month for the G20 summit (here's an explanation of that Australianism, and above is a famous example from 1989). Previously, the Government had flirted with the idea of trying to ban Putin from the G20 over Russia's role in the downing of MH17, but that has now been ruled out.

To discuss diplomatic shirtfronting (and BTW, Abbott has recently retreated from his aggressive tone somewhat) and other G20 Summit matters, yesterday I spoke with the Director of the Lowy Institute's G20 Studies Centre, Mike Callaghan. The Lowy Institute recently released Mike's G20 Brisbane Summit Form Guide: What Will Make the Summit a Success?