DUBAI - Iranian President Hassan Rouhani and visiting Chinese counterpart Xi Jinping said on Saturday their countries had agreed to expand economic and political ties, calling it a 'new season' in bilateral relations. 'We are happy that President Xi visited Iran after the lifting of sanctions...Iran and China have agreed to increase trade to $600 billion in the next 10 years,' Rouhani said at the news conference with Xi broadcast live on the state television. China was one of six world powers to negotiate a landmark deal with Iran last July under which Tehran has curbed its disputed nuclear program and won a removal of isolating international sanctions in return.