The US is working with Ukrainian pilots in the United States to determine how long it would take to train them to fly F-16 fighter jets, three sources briefed on the matter told CNN.

China has set an official economic growth target of "around 5%" for 2023, as it seeks to revive the world's second largest economy after a year of tepid growth because of pandemic measures.

Nearly 200 countries have agreed to a legally-binding treaty to protect marine life in international waters, which cover more than half of the planet's surface, but have long been essentially lawless.

The postcard image of Hong Kong is one of glitzy skyscrapers against lush mountains, dim sum restaurants and investment bankers in suits.