Why is North Korea blowing up roads, railways to the South?

economictimes.indiatimes.com:

North Korea appears very unhappy with the South at the moment — but why?
AFP takes a look at what we know:
What has changed?

For decades, North Korea was officially committed to reunification, and in their constitutions, both North and South Korea claim sovereignty over the whole of the peninsula.

But in January, the North's leader Kim Jong Un declared South Korea his «principal enemy», cut all communications to an «irretrievable level», and had mentions of «reconciliation» or «fellow countrymen» scrubbed from record.

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