Business Insider reports Norwegian deputy central bank governor Jon Nicolaisen resigned on Friday.<br />Nicolaisen was in charge of Norway's $1.2 trillion sovereign wealth fund, the biggest in the world.<br />He stepped down after Norway's security service rejected his security clearance because his wife is Chinese and lives in China.<br />The pair have been married for ten years, but Norway has become stricter on ties to China and Russia in recent years.<br />Norway's intelligence service says the two countries are trying to find out information about Norway's petroleum industry.
