In late February, U.S. President Donald Trump called for adding $54 billion to the U.S. military budget—an increase of roughly 10 percent. And in early March, despite outcry from Beijing, the United States began deploying the Terminal High-Altitude Area Defense System (THAAD) in South Korea, after Pyongyang tested four missiles that further stoked fears of a North Korean attack on Japan, South Korea, or the United States. Is this the start of a transpacific arms race?