New Delhi, July 9 -- China's navy test-launched a long-range ballistic missile Monday from a nuclear-powered submarine - a move that experts said showed Beijing's increasing skill and capability as part of its nuclear deterrence strategy.

The move also drew protests from the U.S. as well as countries in Asia and the Pacific. It was the second time China had fired a ballistic missile into international waters in recent years. While it gave some countries in the region prior notice, some said it was not enough notice, and experts say the launch exacerbates tensions around increasing militarization in Asia.

Here's what we know, and what we don't, about the missile launch.

Experts think it could be a JL-2 or a JL-3 ballistic missile

China...