"I warmly congratulate H.E. Mr. Moon Jae-in upon his election as President of the Republic of Korea," he tweeted in English and Korean languages.
Moon, South Korea's first liberal leader in a decade, assumed presidential duties this morning after the National Election Commission finished counting yesterday's votes and declared him winner.
The special election was necessitated by the ousting of conservative Park Geun-hye, whose downfall and jailing on corruption charges is one of the most turbulent stretches in the nation's recent political history.
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