Asia-Pacific markets were set to open mixed Tuesday, after U.S. President Donald Trump took aim at South Korea overnight, threatening to increase tariffs on Asia’s fourth-largest economy.

Trump said on Truth Social that the country’s legislature has not approved Seoul’s trade deal with Washington, and that tariffs on the South Korea will climb to 25%, from 15%.

The threat could dent sentiment in South Korean markets, which has notched 15 days of gains out of the 17 sessions since the start of the year.

Australia’s S&P/ASX 200 started the day 1.12% up, reaching its highest level in almost 3 months, coming back from a holiday on Monday.

Japan’s Nikkei 225