Why is North Korea fortifying its border with South Korea?

Summary
The latest ballistic missile launch comes amid rising border tensions with South Korea and uncertainty over potential nuclear talks with the US. North Korea has launched ballistic missiles off its east coast into the Sea of Japan, South Korea said on Thursday, as tensions continued to rise between the two countries. Covered by 5 outlets: 2 lean left, 2 are centre, 1 lean right.
Automated summary picked from the outlets' own descriptions.
Who is covering this
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Why is North Korea fortifying its border with South Korea?
A row over a landmine blast and a threat to resume loudspeaker broadcasts has highlighted Kim Jong-un’s military ambitions Last week North Korea hit the headlines with a vow to fire up its loudspeaker systems to blare propaganda into the South, but the latest dispute comes...
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North Korea fires ballistic missiles off east coast as tensions with South rise
North Korea has launched ballistic missiles off its east coast into the Sea of Japan, South Korea said on Thursday, as tensions continued to rise between the two countries.
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North Korea fires missile barrage toward the sea as tensions with South rise
South Korea says North Korea has launched a barrage of ballistic missiles toward the sea
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North Korea fires ‘around a dozen’ ballistic missiles into East Sea
Pyongyang has yet to respond to Seoul’s proposal for military talks.
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North Korea fires around 10 ballistic missiles into sea
The latest ballistic missile launch comes amid rising border tensions with South Korea and uncertainty over potential nuclear talks with the US.