The country's most ambitious strategic ballistic missile, Agni-III, built to destroy targets 3,500-4,000 km away is technically ready in all respects for a schedule of three flight tests, including one with the end user, DRDO chief M Natarajan said. The nuclear-capable missile has been ready for test-firing as far back as in mid-2004, though the government is yet to give its approval. South Block sources said the test-firing of the missile needed to be timed right as it would send out a