Mr Bush would fail to obtain from China a public list of weapons it would not export to countries he considers 'rogue nations', officials said. 'Weapons proliferation is the issue that Washington most wants to talk about,' one Chinese official said. 'It wants a legal document from China of weapons that it will not export to certain countries. But Beijing will not agree to such a document. The most it will do is verbal, private assurances.' Mr Bush's national security adviser, Condoleezza Rice, said last week that discussions with China on export controls had been 'more forthcoming'. 'But there is still a tremendous amount of work to do,' she said. On the Chinese side, President Jiang Zemin would ask for the return of Chinese Uygurs captured in Afghanistan while fighting for the ousted Taleban regime. 'I hear that this has already begun,' one diplomat said. 'It is a sensitive issue for Bush at home, so the US side does not want to talk about it in public.' Mr Jiang is expected to visit the US after attending the annual Asia-Pacific Economic Co-operation forum meeting in Mexico later this year and wants an invitation to Mr Bush's ranch in Texas, like Russian President Vladimir Putin. Vice-President Hu Jintao is also expected to go to America this year, as the guest of Vice-President Dick Cheney. After today's joint news conference with Mr Jiang, Mr Bush will visit an exhibition of bus engines made by the US company Cummins Power Generation at the St Regis Hotel, and tonight attend a welcoming banquet at the Great Hall of the People. Tomorrow, he will give a speech at Tsinghua University and visit the Great Wall. He is due to depart for home in the afternoon.