North And South Korea Launch Ballistic Missiles Hours Apart

South Korea conducted its first underwater ballistic missile test from a 3700-ton submarine. This test followed North Korea's launch of two short-range weapons and a long-range cruise missile. Japan's Prime Minister criticized the escalating arms race as outrageous.

Describe the nature of the missile test conducted by South Korea.

What was the context surrounding the missile tests conducted by both North and South Korea?