That's an information invasion, not a military one. It's led by North Koreans who have escaped, and it has the potential to transform North Korea--as I describe in my new book, Escape from North Korea: The Untold Story of Asia's Underground Railroad.
You can't make a phone call to North Korea, or send an e-mail, or even mail a letter. Yet the exiles have found creative ways to get information back home. They hire Chinese couriers to go to North Korea, knock on the door of a relative and deliver a verbal message. Or they have the courier give the relative a Chinese cell phone. The relative then goes to a border area at an appointed time, turns on the cell phone, captures a Chinese signal, and waits for a phone call from his daughter or sister or whoever who has fled to South Korea.
Some exiles have founded organizations dedicated to getting information into the North: radio broadcasts; flash drives containing information and dropped by balloon near university campuses, where professors and students are likely to have access to computers (though not the Internet); DVDs containing South Korean soap operas smuggled into the North. I interviewed a young dancer from Pyongyang who told me how she decided to leave after watching an illegal videotape of a South Korean TV show. She couldn't believe her eyes at first --the food on the table, the rich lifestyles, the freedom of speech. She realized that the propaganda she had been hearing all of her life was a lie.
This is all changing North Koreans' perception of the world -- and of their own country. The U.S. needs to do more to encourage this information flow. Information helped bring down the Soviet Union. It can help bring down the brutal regime that runs North Korea.