By Laurie Chen BEIJING (Reuters) -China and the European Union agreed their trade relationship should be more balanced at their first in-person summit for four years on Thursday, but gave no sign of resolving differences on a range of issues. Pressing Beijing over the EU’s big trade deficit with China, EU leaders said Europe would not tolerate “unfair competition” from China, and Beijing warned the EU that it expected prudence from Brussels when introducing “restrictive” trade policies. There was also no sign that the EU had made any progress in persuading China to use its influence on Russia …