In his first speech to the UN General Assembly, Foreign Minister Tang Jiaxuan painted a positive picture of China as a leading world player and one determined to set the pace in nuclear disarmament. Mr Tang criticised India and Pakistan for their recent nuclear tests and urged them to immediately join the global test ban treaty. 'I would like to reiterate that China will abide by the provisions of the treaty and has no intention to resume testing,' said Mr Tang. On the Asian financial crisis, Mr Tang said despite the massive pressure on China's economy, Beijing would keep to its promise not to devalue the yuan and was committed to ensuring an eight per cent rise in economic growth. But in comments clearly directed at Japan, he said: 'We hope those developed countries with influence on the region's economy will shoulder their responsibility and take active, resolute and effective measures to promote the recovery of the region's economy.' Mr Tang's speech made no mentions of past Chinese criticism of United States' hegemony in global affairs. He warned the West not to manipulate reforms of the UN Security Council. 'The Security Council is not a club of rich countries,' he said. 'More attention should be given to developing countries.' Taiwan Foreign Minister Jason Hu Chih-chiang denied Costa Rica was poised to switch diplomatic ties to China after Mr Tang met his Costa Rican counterpart Roberto Rojas. 'Meetings like this are simply unavoidable,' said Mr Hu. 'We have been assured by Costa Rica and we should entrust its sincerity.'