The two Koreas did what was unthinkable just a few months ago, they held a peace summit where Kim Jong-un actually went onto South Korean soil, the first time a leader from the north has done so in more than 50 years.

Should we be hopeful? Cynical? A combination of the two? How does this compare to the Berlin Wall moment and how much credit does Donald Trump deserve?

Listen as Brian interviews international affairs columnist for the Kingston Whig-Standard, Geoffrey Johnston on all these questions.