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News that Citigroup sold a stake in itself buoyed Japan stocks and the dollar, but Hong Kong hit by Bank of China stake sale. MOREINFO: Dollar rallies as Citigroup news warms risk demand. SCRIPT: Asia stocks put in a mixed performance on Tuesday. Trade was volatile with Japan's Nikkei moving in a wide 510 point range. The Nikkei closed 0.6 percent higher with banking shares among the most active. News that U.S. financial giant Citigroup has reached a deal to sell a $7.5 billion dollar stake in itself to the Abu Dhabi Investment Authority was the key market mover. The sale is seen providing a shot of funds to the biggest U.S. bank. Citigroup has been one of the hardest hit by the subprime mortgage defaults and resulting credit crunch. The languishing U.S. dollar jump on the news with exporters such as Sony also gaining ground as the yen weakened. Hong Kong shares however did not get a much needed bounce, ending 1.5 percent lower. Bank of China shares plunged more than 5 percent after a key shareholder sold a 567 million dollar stake in the firm. Singapore's state investment agency Temasek sold the shares which it bought during Bank of China's initial public offering last year. It is the second largest shareholder in Bank of China after the Royal Bank of Scotland. Tara Joseph-Hui reporting for Reuters. COMPANIES MENTIONED: SYMBOLS: