North Korea could launch an intercontinental missile test or even a nuclear test to try to overshadow U.S. President Joe Biden's upcoming visit to South Korea, an expert told CNBC on Friday. "They've already done two intercontinental ballistic missile tests earlier this year and we've been seeing tunneling activity preparing for a nuclear test," Bruce Klingner, senior research fellow at The Heritage Foundation, told CNBC's "Street Signs Asia" on Friday. He added that such a test would be intended to "overshadow" Biden's trip. The White House has been bracing itself for such a move by North Korea during Biden's first Asia visit as president. "Our intelligence does reflect the genuine possibility there will be either a missile test or a nuclear test or both," U.S. national security advisor Jake Sullivan told reporters on Wednesday, a day before Biden departed for Asia. Biden arrived in Seoul on Friday for a three-day visit in South Korea, and will travel to Tokyo, Japan on Sunday. He is attending a Quad summit hosted by Japan, where leaders of the four-nation Quadrilateral Security Dialogue are meeting. It is a strategic grouping made up of the U.S., Australia, Japan and India, aimed at countering China's looming military presence in the Indo-Pacific. The Heritage Foundation's Klingner said while the U.S. would like to talk to Pyongyang on a range of issues in . . . read the full article here.