Chinese President Hu Jintao on Tuesday urged the navy to prepare for military combat, amid growing regional tensions over maritime disputes and a US campaign to assert itself as a Pacific power.

The navy should "accelerate its transformation and modernisation in a sturdy way, and make extended preparations for military combat in order to make greater contributions to safeguard national security," he said.

Addressing the powerful Central Military Commission, Hu said: "Our work must closely encircle the main theme of national defence and military building."

His comments, which were posted in a statement on a government website, come as the United States and Beijing's neighbours have expressed concerns over its naval ambitions, particularly in the South China Sea.