KOREAS-TENSION — North Korea says its military is ready to pre-emptively attack and "liberate" the South if it sees signs that American and South Korean troops involved in annual joint military drills are attempting to invade the North. 

CHINA-ECONOMY — In a new effort to dispel anxiety about China's cooling economy, the central bank governor says the country can hit this year's official growth target and Beijing has no need to weaken its currency to boost sagging exports.

SKOREA-GAME-HUMAN VS COMPUTER — Google's Go-playing software defeats a human champion for the third straight time to clinch the best-of-five series and establish its superiority in an ancient Chinese chess-like game long thought to be the realm of humans. 

INDIA-MSF-PFIZER

NEW DELHI — Doctors Without Borders has challenged Pfizer's application for an Indian patent for its pneumonia vaccine so cheaper versions can be available to children in poor countries and to humanitarian organizations.