China has hit back after US tariffs on Chinese goods came into effect and President Donald Trump threatened to impose more.

China’s commerce ministry said it had lodged a new complaint with the World Trade Organization (WTO).

Meanwhile, Russia has announced extra duties on US imports in retaliation for earlier US steel tariffs.

Beijing has accused the US of starting the "largest trade war in economic history".

What tariffs are now in effect?

US tariffs on $34bn of Chinese goods came into effect on Friday.

China retaliated by imposing a similar 25% tariff on 545 US products - including cars, soya beans and lobsters - also worth a total of $34bn.

Russia is introducing extra duties on a range of products imported from the US that can be replaced by locally made equivalents.

They include road-building equipment, products for the oil and gas industry, and tools used in mining.