Herzegovina, September 12, SPA -- Bosnian and Chinese leaders are signing three contracts that aim to improve the relationship between the two states. During a visit Friday to Bosnia, China's vice-premier in charge of industrial policies, Zhang Dejiang, signed the documents with Bosnia's Prime Minister Nikola Spiric. One was a 2008 to 2011 program on cultural cooperation, another was promoting investments and a third contract was on mutual assistance in human resource projects. Spiric said he hopes the two countries will strengthen economic and trade ties. During his visit, Zhang Dejiang is also meeting with the three members of Bosnia's presidency, the Associated Press reported.