After the daring U.S. raid that killed Osama bin Laden in his hideout next to Pakistan's premier military academy, Islamabad has openly played its China card to caution Washington against pushing it too hard. And China has been more than eager to show itself as Pakistan's staunchest ally.

China's deepening strategic penetration of Pakistan — and the joint plans to set up new oil pipelines, railroads, and even a naval base on the Arabian Sea that will serve as the first overseas location offering support to the Chinese navy for out-of-area missions — are spurring greater U.S. and Indian concerns. For India, the implications of the growing strategic nexus are particularly stark because both China and Pakistan refuse to accept the territorial status quo and lay claim to large tracts of Indian land.

An influx of up to 11,000 soldiers of the People's Liberation Army into Pakistan's Himalayan regions of Gilgit and Baltistan to supposedly work on new projects, including a railroad, an upgraded highway, dams and secret tunnels, has raised concerns that those strategic borderlands could come under the Chinese sway. The predominantly Shiite Gilgit and Baltistan are in Kashmir, where the borders of China, India and Pakistan converge.