BBC: North Korea's foreign minister has arrived in Burma for talks with top leaders, reports from the region say. It is thought to be the first visit by Pak Ui-chun since the two countries resumed formal ties in 2007. Mr Pak will travel to the capital, Naypyitaw, for talks with counterpart Nyan Win, officials said. Analysts have raised concerns in recent months that Burma is co-operating with North Korea to develop nuclear technology. Burma denies this.

Last week US Secretary of State Hillary Clinton said she was concerned about military ties between the two authoritarian states.

Wall Street Journal correspondent Evan Ramstad is available in Seoul.