China, UN coPeaceful principles playing key role in intl relations, FM saysXi holds talks with Angolan presidentXi congratulates Zardari on election as Pakistani presidentJapan offers $20m to IAEA during agency's head visitXi holds talks with Angolan presidentXi emphasizes no letup in drive to combat air pollutionChina firmly opposes Taiwan politician's official contacts with Czech: Chinese FMWorld reporters gain insights at two sessionsChina's top legislature to hold closing meeting on Monday