India, July 15 -- Asian stocks moved broadly highly on Wednesday amid optimism about a potential coronavirus vaccine, although Chinese markets fell on rising U.S.-China tensions.

Biotech firm Moderna said its experimental vaccine for Covid-19, mRNA-1273, showed it was safe and produced strong immune responses in all 45 patients in an ongoing early-stage human trial.

Chinese stocks fell sharply after U.S. President Donald Trump ordered an end to Hong Kong's special status under U.S. law, prompting a warning from China.

China's foreign ministry said in a statement Beijing will impose retaliatory sanctions against U.S. individuals and entities in response to a law targeting banks doing business with Chinese officials.

The benchmark Shang...