On Fareed Zakaria GPS this Sunday at 10a.m. and 1p.m. EST, an exclusive interview with the top-ranking military officer in the U.S., Chairman of the Joint Chiefs of Staff, Martin Dempsey. Fareed has a wide-ranging discussion with Dempsey on Iran, Syria, China, budget cuts, and more.

Martin Dempsey:  I think it would be premature to exclusively decide that the time for a military option was upon us. I think that the economic sanctions and the international cooperation that we've been able to gather around sanctions is beginning to have an effect. I think our diplomacy is having an effect and our preparedness. I mean, fundamentally, we have to be prepared.  And that includes, for the most part, at this point, being prepared defensively.

See more highlights on CNN's Fareed Zakaria GPS page