Shares have retreated in Asia, with benchmarks in Japan, Hong Kong and South Korea falling more than 2% after Wall Street indexes fell sharply on doubts over the frenzy around artificial-intelligence technology.

Asian stock markets fell while the yen strengthened as President Trump’s fresh tariff threats spooked investors.

Asian markets tumbled on Friday as US President Donald Trump's volley of tariff measures sparked fresh fears about a global trade war that could hammer struggling economies.