South Korea made the statement after the sister of North Korea's leader warned of retaliatory measures against the country over anger toward defectors sending back propaganda leaflets.
A stronger relationship between the two will trigger another headache for the US, but this time in its own hemisphere.
Rumours have been circulating about the health status of North Korea's leader, who was last seen in public on April 11 and was not in attendance for the country's most important holiday.
A barrage of North Korean missiles fired from both the ground and fighter jets splashed down on the waters off the country’s east coast, a show of force on the eve of a key state anniversary in the north and elections in the rival south.
The string of weapons drills come as a prolonged hiatus in disarmament talks with the United States drags on, and despite recent overtures from Washington offering help to contain the pandemic.
State media reported that North Korean leader Kim Jong-un supervised his second live-fire artillery exercise in a week
South Korean President Moon Jae-in said that US President Donald Trump’s recent letter to North Korean leader Kim Jong Un was a good sign that underscores his commitment to negotiations, as well.
The eight women and three men were caught by border guards in northern Vietnam in late November after crossing from China, and had been held in the northeastern border city of Lang Son.
Kim also said North Korea was no longer obligated to maintain a self-imposed suspension on the testing of nuclear weapons and intercontinental ballistic missiles, which President Donald Trump has touted as a major diplomatic accomplishment.
The appeal was made by a group of women forced to work in Japan's wartime military brothels to strike down a deal signed by the two Asian countries to settle claims over the abuse.
Seoul's Defense Ministry said in a brief statement that South Korea and the United States are closely monitoring activities at the Sohae site and other key North Korean areas.
The projectiles were fired eastwards from South Hamgyong province and came down in the Sea of Japan, also known as the East Sea, South Korea's Joint Chiefs of Staff says.
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