Iran’s foreign minister, Mohammad Javad Zarif, is in demand these days. On the sidelines of the U.N. General Assembly, he shook hands with President Obama and met twice with Secretary of State John Kerry. (Zarif and Kerry have been nominated, jointly, for the Nobel Peace Prize, scheduled to be announced this week, for their two-year negotiations on the Iran nuclear deal.) Zarif hosted both Republican and Democratic officials from previous U.S. Administrations, breakfasted with editors, huddled with American nuclear experts, and briefed the Times editorial board. He also squeezed in a session with the University of Denver, his alma mater; the event was streamed live from the Waldorf-Astoria, because Iranian diplomats are not allowed to travel beyond a twenty-five-mile zone around New York.

The day before Zarif returned to Tehran, I spoke with him at the residence of Iran’s U.N. ambassador, on Fifth Avenue, near the Metropolitan Museum. The interview has been condensed and edited for clarity.

Did you know that Obama was going to come up and shake your hand?

No. It’s not customary for a head of state to plan shaking hands with a foreign minister. That’s even an insult for a head of state to plan. Obama had spoken to the General Assembly two hours earlier, and we did not expect him to be back in the Assembly Hall. As I was getting out, President Obama, I don’t know for what reason, was entering the General Assembly Hall, and we simply ran into each other. On and off the record, it was an accident.

Is this going to cost you at home?

It has already cost me at home. But everything I do costs me at home, so this is not an aberration.

Why was President Hassan Rouhani unwilling to see President Obama? White House officials made clear to me and others that they were interested in trying to make that work this time.

Because we believe that what is right now on our agenda is the implementation of this agreement, and that is the No. 1 priority. You don’t need to do things that would complicate that. What is important for us is the substance, not the appearances, and I mean photo ops.

For eighteen months, you’ve been telling me about your four-point plan for Syria. Where does that stand?

It has evolved, but it still has four points. The gist of it, however, is a national-unity government, a ceasefire, fighting terrorism, constitutional reform, and creation of a permanent government structure based on the new constitutional institutions that have been created. This is basically the gist of any plan that we believe would be workable in Syria.

Of course, any plan should also have a number of principles that everybody should subscribe to, with respect to sovereignty, territorial integrity, fighting extremism, sectarianism, and non-interference in the internal affairs of Syria, a political solution, respect for minority rights, human rights. We are just making suggestions. We are not making any rigid proposal. We are in the process of talking, consulting with various regional and extraregional players on this.

How wedded to President Assad is Iran?

What we have been saying from the beginning is that this is a decision that the Syrian people have to make. We are against people and governments outside Syria setting preconditions for a political solution in Syria. One way or another, we’re not setting any preconditions. We believe that’s not our job. We believe we should leave it to the Syrians to decide. We should facilitate national unity, national reconciliation among Syrians, and then should facilitate an outcome that is stable and democratic, and then allow Syrians to make their own decisions about who should govern them, and how they should be governed.

Is the United States aware of this plan?

The United States is regularly briefed by its European allies, as well as by the United Nations, and all of them have been privy to our thinking.

Do the Russians support your idea?

I believe our thinking on that situation is very similar.

The Russian bombings of Syria—were you taken by surprise when they started?

Not necessarily, because there was this need for an international effort, and we’ve been calling for an international effort to deal with Daesh [the Islamic State] and other similar terrorist organizations, like Jabhat al-Nusra [also called Al Qaeda in Syria] and Ahrar al-Sham and similar splinter groups, which pop up every other hour in Syria.

What do the Russians ultimately want out of this bombing campaign?

What the United States should have wanted from this bombing campaign—and that is to destroy Daesh.

But is it also to insure that President Assad survives, or is it to facilitate a process? I’ve been wondering whether the new movement is actually getting us closer to negotiations, or whether it’s dividing the countries, the major powers, even more.

I think it gets us closer to negotiation from several different angles. These circumstances provide opportunities, as well as challenges. If we take the opportunities, we make something out of them. If we don’t take the opportunities, then we are only left with challenges.

Why are you confident that the Russians are interested in negotiations rather than simply insuring that Assad stays in power?

Because there is no military solution in Syria. At the end of the day, everybody has to negotiate. And I think everybody understands this. There has to be a political solution to Syria, everybody committed to a political solution. The military battleground has its ups and downs. But the military battles alone will not determine the future of Syria.

Russia’s first target was not ISIS or the al-Nusra Front.

It was. The first target was the new group that has been created out of the combination of al-Nusra and Ahrar al-Sham, called Jaish al-Fatah. These groups get new names every other day.

In terms of Iran’s presence, there were reports in the past week of Iranian troops in Syria, not just military advisers.

Wrong. We haven’t changed the nature of our presence in Syria. It continues to be military advisers, and no more. Actually, I checked, and I made sure that this was the case.

But Iran supports Russia’s involvement in Syria.

We support anybody’s involvement against Daesh, provided that it’s serious. The problem with the international coalition was that it was never serious, because it had political inhibitions against hitting Daesh, because they believe that hitting Daesh before they have a solution for Bashar al-Assad would help Bashar. So there is just a show going on, and that is why the ability of Daesh has not even been dented over the past year.

How does this play out? We have an unprecedented number of countries engaged in Syria militarily now. How do we get from this moment to negotiations?

As soon as you get ready to talk about the future of Syria without preconditions. That requires a major, major soul-searching on the part of the West. Their predictions were wrong. They were expecting to unseat Assad four Ramadans ago. Instead of three weeks, it has been four years and hundreds of thousands of casualties and millions of people displaced from their homes.