However, India's 45 Kt, two-stage thermonuclear explosion during the tests of May 1998 has the potential to be upgraded to a practical capability of about 200 Kt only.76 For weapons in the megaton class to be developed, further refinement of the design and additional physical testing would be necessary. As India has unilaterally renounced further nuclear tests, it is doubtful if such a capability can be created. Also, as missile accuracies continue to improve and CEPs drop to hundreds of metres and lesser, the trend among the P-5 is to limit warhead yields to between 200 to 300 Kt. Yields in this range should be adequate for India's purposes also for a counter-value strategy provided India can develop ballistic missiles with a CEP of less than 500 metres.