Why not un-freeze N. Korean Bank?

Question

"Seoul, Oct 23: North Korea is willing to return to six-nation nuclear disarmament talks if the United States promises to lift a freeze on its accounts in a Macau bank, a South Korean legislator said on Monday." http://www.zeenews.com/znnew/articles.asp?aid=330997&sid=WOR

Answer 1

North Korean banks should be freezed and boycotted as a protest to stop its nuclear arms build-up.