US and Filipino troops fire missiles and artillery at an imaginary "invasion" force during war games on the Philippines' northern coast Monday, days after their governments objected to China's "dangerous" actions in regional waters. Thousands of troops are conduct land, sea and air manoeuvres against a backdrop of increased confrontations between Chinese and Filipino vessels around shoals in the South China Sea claimed by Manila, as well as stepped-up Chinese air and naval activity around nearby self-ruled Taiwan. IMAGES AND SOUNDBITES