North Korea, China, and Russia are well known for control of media.
Lesser known is the control of media in Japan, Korea, and other countries.
Though democratic, most media in many countries are controlled by conservatives or wealthy.
Many are owned outright by the wealthy, or are puppets to wealthy advertisers.
At least we have social media and the internet nowadays. Sort of counteracts the negative aspects of traditional media but has its faults.
China, Mongols, Japan, North Korea. Throughout history, many have tried to take over Korea, which is just a very small 3-hour drive wide and 5-hour drive long peninsula.
When North Korea (supported by Russia) invaded South Korea (vice-versa in North Korean media and schoolbooks), the US and UN stepped in at the last moment when only the southern port city of Pusan was left.
Thankfully, a lot of people from all over the world fought in the Korean War. Tragically, too many died.
The USA, Great Britain, Canada, France, Belgium, Netherlands, Colombia, Ethiopia, South Africa, New Zealand, Turkey, Greece, Thailand, Philippines and Luxembourg sent armed forces to fight in the war. Many other countries sent medical supplies and aid.
South Korea was extremely fortunate. Russia was boycotting the UN and China did not have any power in the UN. Otherwise, they definitely would have vetoed sending the UN forces to South Korea.
Koreans say that we succeeded because of hard work and stuff, but I think it is mainly due to the relations and trade we have had with the US (even through trade frictions, mainly due to unfair Korean practices and large trade surpluses for Korea).
Imagine if we were sanctioned...
Another perspective. Lots of Christians in South Korea. Lots of Christians in the US. Lots of Christians in the Philippines. Lots of Christians in China, Japan, Indonesia, all over the place.
Still, Christianity is less prevalent than before.