Hi,
The answer is China
Over time, China has demonstrated their support to North Korea. In 2010 North Korea attacked with artillery the island of Yeonpyeong, where there were civilians, and South Korea responded by attacking North Korea's artillery.
Tensions scaled, and although most world governments condemned the attack, China's Ministry of Foreign Affairs didn't explicitly condemn the bombarding by North Korea and only made a call to peace in the Korean Peninsula.