North Korean leader Kim Jong Un is poised to declare his signature ruling policy during a rare party congress in May and, despite tough new U.N. sanctions, it is likely to be the twin pursuit of nuclear prowess and economic development.

North Korea's official media have carried almost-daily reports and commentary extolling the "sacred road" to the day Kim's leadership will be endorsed at the "victorious and glorious 7th party congress."

This week marks the halfway point in what state media describes as a 70-day "top-speed dash to glorious victory," a campaign that calls for ramped-up productivity and a sprucing-up of the capital Pyongyang as it prepares to greet delegates.