This week, our lads find themselves in the presence of Professor Stephen Walt.

A professor of politics at the Harvard Kennedy School, Walt is the arch neo-realist, often bracketed alongside John Mearsheimer.

Walt made his name opposing the Iraq War. He has long taken a cautious approach to US and Western foreign policy. He recently wrote that he sees a role for a Sino-American peace plan in Ukraine.

Historically, Walt has advocated for looser relations with Iran; he was sympathetic to maintaining Gaddafi's Libya, and is skeptical of the power of the Israel lobby in driving America's Middle Eastern policy.

Walt speaks to Europe's role in an increasingly multipolar world - as America looks to pivot to Asia, will the continent be capable of stepping up? Or will that step require more political co-ordination than the present EU can cope with? And how will America actually deal with having to relinquish the reins?

Finally, the lads want to know: will the multipolar age more stable, because power is diffused? Or will it be it less so - because two distinct great powers are much more predictable?