India and China have started a joint military anti-terrorism exercise, the first such drill between the two largest armies in the world.
The week-long training mission, named "Hand-in-Hand, 2007," involves about 100 troops from each country holding exercises in southern China's Yunnan province.
Chinese officials say the drill is aimed at deterring what they call the "three evil forces" of separatists, extremists, and terrorists.
Both governments are trying to counter domestic separatist movements.
In China, the government has waged a campaign against Uighur Muslims seeking independence in the oil-rich northwestern region of Xinjian. India has long battled Islamic militants in Kashmir and communist insurgents in poor, rural communities.
India and China have tried to expand trade and diplomatic ties in recent years although they still have several territorial disputes. The two countries fought a brief war in 1962 over their disputed Himalayan border.
Some information for this report was provided by BBC and Reuters.