Ms. Trump, daughter of President Donald Trump, landed in the afternoon and headed to the presidential Blue House in Seoul for a dinner with President Moon Jae-in.
She is scheduled to attend the Winter Olympics’ closing ceremony Sunday, where a North Korean delegation also will be present. Officials from South Korea and the U.S. say it was unlikely that Ms. Trump would meet the North Koreans.
Separately in Washington, the Trump administration announced what it said was its largest-ever North Korea sanctions package, hitting dozens of shipping and trading companies as it seeks to further cut off foreign-currency revenues keeping the nuclear-armed regime afloat.
The decision by Mr. Moon to accept a North Korean delegation headed by military leader Kim Yong Chol, a four-star general sanctioned by Seoul and Washington for allegedly masterminding two deadly attacks on South Korea, triggered sharp domestic criticism.
Kim Sung-tae, a senior lawmaker in the main conservative opposition party, said Seoul shouldn’t allow the general to set foot in South Korea. “If he does come, the war criminal should be arrested and jailed immediately,” he said in a Facebook post.