US President Joe Biden (left) and South Korean President Yoon Suk Yeol at a press conference in Seoul, South Korea, in May 2022. (Photo: Reuters)

Yoon's week-long state visit from Monday comes at a time when more South Korean think their country should develop its nuclear arsenal to guard against attack by nuclear-armed North Korea.

In a poll recently released by the Asan Institute for Policy Studies in Seoul, 64.3% of South Koreans supported developing nuclear weapons with 33.3% opposed

On Friday, the US and South Korea conducted joint air exercises. A video provided by South Korea's Ministry of National Defense shows multiple US and South Korean warplanes flying in aerial formations and pilots attending pre-flight briefing.