Russian President Vladimir Putin, left, and China's President Xi Jinping shake hands prior to their talks on the sideline of the 11th edition of the BRICS Summit, in Brasilia, Brazil, Wednesday, Nov. 13, 2019.

Russian President Vladimir Putin, left, and China's President Xi Jinping shake hands prior to their talks on the sideline of the 11th edition of the BRICS Summit, in Brasilia, Brazil, Wednesday, Nov. 13, 2019. Ramil Sitdikov, Sputnik, Kremlin Pool / via AP

Best of 2019: The Technology of Defense

Here's a look back at some of the top defense-technology-related stories of the year:

China, Russia Deepen Technological Ties

With joint dialogues, incubators, and technology parks, Beijing and Moscow are seeking to overcome deficiencies and compete with the United States. // Samuel Bendett, Elsa B. Kania

US Intelligence Officials and Satellite Photos Detail Russian Military Buildup on Crimea

Five S-400 anti-aircraft missile batteries, plus additional troops and fighters, let Moscow better defend the Black Sea and threaten Europe and the Middle East. // Patrick Tucker

Zap: How Electric Therapy Is Curing Navy SEALs of PTSD

Hundreds of vets have tried out an experimental new treatment that could change how the world addresses mental disorders // Patrick Tucker

Pentagon Wants Satellites That Can Dodge Incoming Fire

As China and Russia move to weaponize space, the U.S. military is working to give its constellations a “fighting chance.” // Patrick Tucker

The West Isn’t Ready for the Coming Wave of Chinese Misinformation: Report

Beijing’s social-media operations are larger and more effective than many realize. // Patrick Tucker

Why the S-400 and the F-35 Can’t Get Along

Today's radar systems and aircraft need to share a lot of information. That's a problem when the countries that produce them aren't on the same side. // Patrick Tucker

The US Military Is Creating the Future of Employee Monitoring

A new AI-enabled pilot project aims to sense “micro changes” in the behavior of people with top-secret clearances. If it works, it could be the future of corporate HR. // Patrick Tucker

A New Consensus Is Emerging On How to Handle The Risk from China’s 5G

Chinese telecom tech is invading the physical world, but Europeans and industry have strategies to contain the threat. // Patrick Tucker

The Future of the Marines Is Smaller, More Robotic, More Naval

The new Commandant of the Marine Corps lays out a vision for high-tech force that will often operate like special forces. // Patrick Tucker

Nuclear Weapons Are Getting Less Predictable, and More Dangerous

Facing steerable ICBMs and smaller warheads, the Pentagon seeks better tracking as the White House pursues an unlikely arms-control treaty. // Patrick Tucker