Donald Trump has said he has given South Korea permission to build nuclear-powered submarines in Philadelphia, in an announcement that could rattle China as the US president prepares to meet Xi Jinping.

The U.S. will share closely held technology to allow South Korea to build a nuclear-powered submarine, President Donald Trump said ahead of a meeting with China’s leader Xi Jinping.

South Korean auto and shipbuilding stocks rallied Thursday after Seoul and Washington finalized a trade deal announced back in July. Hanwha Ocean spiked as much as 14.9% while Samsung Heavy Industries climbed 8.33% at its peak. Defense product maker Firstec also rose as much as 9.7%.

U.S. President Donald Trump said on Thursday he has given South Korea approval to build a nuclear-powered submarine, a dramatic move that would admit Seoul to a small club of nations possessing such vessels.

The United States will share closely held technology to allow South Korea to build a nuclear-powered submarine.

Korean skincare or "K-beauty" products are very popular around the world. But as exports from South Korea hit $10.3bn (£7.7bn) last year, cosmetics companies in other countries have introduced their own K-beauty ranges that are not Korean-made. Does this blurring of the definition matter?

South Korea gifted President Donald Trump an enormous crown during his visit on Wednesday, just weeks after the “No Kings”

President Trump lamented not being able to speak with Mr. Kim, the North Korean leader, but vowed to end the decades of hostilities between the two Koreas.