China is building out and redesigning sites connected to its nuclear weapons program, according to a new report, as the lapse of the world's last treaty limiting nuclear weapons has fueled fears of a new nuclear arms race. Several facilities linked to China's nuclear weapons in country's southwest Sichuan province have been refurbished or expanded in the past seven years, The New York Times reported on Sunday. Newsweek has reached out to the Chinese Embassy in the U.S. via email for comment.