South Korean liberal candidate Lee Jae-myung is projected to win next week's snap presidential election, a result that could reorient a major U.S. ally on policies ranging from China to nuclear weapons and North Korea.

After months of political turmoil, South Koreans will head to the polls Tuesday to elect a president to succeed disgraced former leader Yoon Suk Yeol, who was ousted from office over his ill-fated decision to impose martial law in December.

South Koreans turned out in record numbers to cast their ballots as early voting kicked off on Thursday, with long lines at many of the country's polling stations ahead of the June 3 snap presidential election.