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Tensions between the two neighbors — who are technically still at war — ebb and flow. Earlier this year, an annual exercise between South Korean and U.S. forces, involving thousands of troops and state of the art military hardware, didn’t go down well with North Korea. It fired two short-range ballistic missiles into the East Sea, also known as the Sea of Japan, after slamming the exercises as “dangerous nuclear war drills for invading the DPRK.” Leader Kim Jong Un then called for full combat readiness and oversaw military facilities, according to KCNA.