President Donald Trump says he will visit Beijing in April and host China’s President Xi Jinping for a state visit later next year.

China fiercely objects to what it sees as any outside interference on self-ruled Taiwan, which it claims as its own.

The two leaders discussed trade, Ukraine and Taiwan in their first phone call since meeting in South Korea last month.

When Xi Jinping and Donald Trump sat down in South Korea last month to discuss a pause in their trade war, Taiwan surprisingly didn’t come up. Now the biggest flashpoint between the US and China is firmly back on the agenda.

Trump announced the plans after a call with the Chinese president that he said was focused on the Russia-Ukraine war and agricultural products like soybeans, a major U.S. export.

President Trump said he accepted an invitation from Chinese President Xi Jinping to visit China in April and invited Xi to the US for a state visit.