China decided to deploy submarines armed with nuclear missiles into the Pacific in order to protect themselves against the threat imposed by the US.
Chinese military officials are not commenting on the timing of a maiden patrol, but insist the move is inevitable.
They point to plans unveiled in March to station the US Thaad anti-ballistic system in South Korea, and the development of hypersonic glide missiles potentially capable of hitting China less than an hour after launch, as huge threats to the effectiveness of its land-based deterrent force.
A recent Pentagon report to Congress predicted that “China will probably conduct its first nuclear deterrence patrol sometime in 2016”, though top US officers have made such predictions before.
China has been working on ballistic missile submarine technology for more than three decades, but actual deployment has been put off by technical failures, institutional rivalry and policy decisions.
Until now, Beijing has pursued a cautious deterrence policy, declaring it would never be the first to use nuclear weapons in a conflict and storing its warheads and its missiles separately, both strictly under the control of the top leadership.
Deploying nuclear-armed submarines would have far-reaching implications.
Warheads and missiles would be put together and handed over to the navy, allowing a nuclear weapon to be launched much faster if such a decision was taken. The start of Chinese missile patrols could further destabilise the already tense strategic standoff with the US in the South China Sea.