German Chancellor Angela Merkel and China's Premier Wen Jiabao (C) watch as German Economy Minister Philipp Roesler (R) and Zhi Shuping, Chinese Minister of the General Administration of Quality Supervision, Inspection and Quarantine (L) sign a treaty in Berlin June 28, 2011. Wen and Merkel aim to boost trade between the world's two biggest export nations to at least 200 billion euros in the next five years, they said at a meeting in Berlin on Tuesday. REUTERS/Fabrizio Bensch (GERMANY - Tags: POLITICS BUSINESS)