AFP: European Union foreign policy chief Catherine Ashton was in China Tuesday ahead of talks with top leaders on trade, climate change and security issues such as the Iran and North Korea nuclear standoffs. Ashton, who visited the World Expo in Shanghai on Monday, will take part in the inaugural EU-China High-Level Strategic Dialogue in the southwestern city of Guiyang on Wednesday, according to the EU. During the dialogue — a forum intended to keep the two sides in contact on key …