U.S. President Donald Trump said on Wednesday the U.S. would charge a 15% tariff on imports from South Korea as part of an agreement to avoid even higher levies.

This deal would mean the duties will be lowered from the 25% that Trump had threatened in his "tariff letter" to Seoul earlier this month.

World shares are mixed after U.S. stocks slipped, as doubts rose on Wall Street about whether the Federal Reserve will deliver economy-juicing cuts to interest rates by September.