The number of respondents, who do not approve of the government's policy, decreased by 9 percent compared to last week’s results and stood at 30 percent, according to Gallup Korea.
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The survey was conducted from Tuesday through Thursday among 1,000 people.
The summit, held on Tuesday and Wednesday, resulted in Seoul and Pyongyang signing a military agreement to cease large-scale artillery exercises and military flights near the demilitarized zone.
In June, Kim reached an agreement with US President Donald Trump stipulating that North Korea would make efforts to promote complete denuclearization in exchange for the United States and South Korea ceasing their joint military drills, as well as potential sanctions relief.