Ash Carter guests hosts an hour of CNBC's Squawk Box. December 13, 2018.

Former U.S. Defense Secretary Ash Carter speaks with The WorldPost’s editor in chief, Nathan Gardels, about the Trump administration’s new China policy, North Korea and the pending U.S. withdrawal from the Intermediate-Range Nuclear Forces Treaty.

To understand how I approached China during my time as Secretary, it’s important to note that I don’t see U.S. strategy in Asia as centered on China at all. I said many times: We don’t have a China policy, we have an Asia policy. The heart of that policy is a mesh of political, diplomatic, economic, and military relationships with many nations that has sustained security and underwritten an extraordinary leap in economic development.

During my time as Secretary, I referred to this structure over and over as the “principled, inclusive network.” Enunciating and reinforcing its strategic and military dimensions in a rapidly changing security environment was my constant priority as Secretary of Defense. Even amid pressing challenges such as the fight against ISIS and the need to confront Russian aggression, no other issue I dealt with had such lasting implications for our national security and prosperity.

My three-word title for this policy was admittedly not very catchy. But my counterparts in the region understood it. They understood that all three words have been essential to its success and will remain essential to its future.

Nineteen years ago, I was in Ukraine when the last nuclear warheads, orphaned during the Soviet Union’s breakup, rolled out of the country. As an assistant secretary of Defense at the time, I had worked with Washington colleagues and foreign counterparts to eliminate those nuclear weapons and thus one danger at the dawn of the post-Cold War world. Together — with bipartisan support in Congress led by Sens. Sam Nunn, a Democrat, and Richard Lugar, a Republican — we succeeded.

Today, the Iran deal provides the opportunity to address an even greater nuclear threat. Congress should support it because, once implemented, the deal will remove a critical source of risk and uncertainty in a vitally important but tumultuous region.

"Iran's continued pursuit of an illicit nuclear program and North Korea's rash intimidation after sinking a South Korean navy ship are but the most recent reminders of the real need for effective U.S. missile defenses," write Under Secretary of Defense for Policy Michele Flournoy and Under Secretary of Defense for Acquisition, Technology and Logistics Ashton Carter.

President Barack Obama announced Monday that he has nominated Dr. Ashton B. Carter to serve as Under Secretary of Defense for Acquisition, Technology and Logistics.

Dr. Ashton B. Carter and Ambassador Robert G. Joseph discuss recommendations stemming from recommendations in final report of the review they co-chaired of the Defense Threat Reduction Agency (DTRA) and other DOD efforts to counter weapons of mass destruction.

A key challenge for the next administration's national security leadership concerns the management of investment in the U.S. national security future. In this paper for the Aspen Strategy Group, Dr. Ashton Carter discusses the challenges of defense budgeting and program selection, and the current mismatch between resources and strategy.

Full text of the trip report from PDP's Track II meetings in Taiwan and the People's Republic of China (PRC).