It also shows "US is comfortable with Indian progress in the nuclear and missile fields", Lisa Curtis, senior research fellow for South Asia, and Baker Spring, research fellow in National Security Policy, at The Heritage Foundation, a conservative think tank said in a commentary.

"India's successful test of the Agni-V, a nuclear-capable long-range missile, is a major step forward for New Delhi in attaining nuclear deterrence against regional rival China," they said calling it as "telling that no country has criticised India's missile test."