South Korea's Yoon Suk-yeol has vowed to get tough with Pyongyang. (File)
Yoon Suk-yeol was sworn in as South Korean president Tuesday in a huge ceremony at Seoul's National Assembly, taking office at a time of high tensions with the nuclear-armed North Korea.
"I solemnly swear before the people that I will faithfully perform the duties of the president," said Yoon Suk-yeol, a hawkish conservative who has vowed to get tough with Pyongyang.
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