Mon 11 Nov 2006Bush asks Putin and Hu to help on nuclear North Korea and IranVIETNAM: US president George Bush sought help from China and Russia yesterday on thwarting the twin nuclear challenges of North Korea and Iran as security dominated his agenda at an Asia Pacific summit.In Hanoi, Mr Bush held separate talks with Chinese president Hu Jintao and Russian president Vladimir Putin, two key players in international efforts to get North Korea to give up nuclear weapons and prevent Iran from developing one.