Kim Yo-jong’s remarks were in response to new calls from South Korea to officially declare the end of the Korean War.
The conflict that divided the peninsula in two ended in 1953 with a ceasefire and not a peace treaty.
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The two countries are still technically at war since then, and are locked in a sometimes strained relationship.
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This week, South Korean President Moon Jae-in called on the two Koreas and their allies, the United States (US) which supports South Korea and China which supports North Korea, to declare officially ending the conflict and bringing peace to the peninsula.
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The idea was initially dismissed by a top North Korean minister as “premature”.