North Korean leader Kim Jong-Un condemned a creeping "cultural invasion," state media said Wednesday, reflecting Pyongyang’s growing concern over its inability to keep the outside world at bay.

North Korean leader Kim Jong-Un condemned a creeping "cultural invasion," state media said Wednesday, reflecting Pyongyang's growing concern over its inability to keep the outside world at bay.

In a speech at the closing ceremony of a conference for top ideological officials from the ruling Workers' Party, Kim also stressed the need to intensify indoctrination efforts and prevent the emergence of "factionalist partisans".

"We must set up mosquito nets with two or three layers to prevent capitalist poison being persistently spread by enemies after sweeping across the border into our territory", Kim was quoted as saying by the North's official KCNA news agency.

"We also have to take the initiative in foiling the imperialists' plots for ideological and cultural invasion," Kim said.

The North Korean regime has successfully isolated its population from the outside world for decades, but the prophylactic power of that information barrier has diminished in recent years.

Smuggled Chinese mobile phones allow people near the border to connect with Chinese servers and make international calls, while re-wired TVs allow access to outside broadcasting.