Six-party talks aimed at dismantling North Korea's nuclear weapons programme have stalled again in Beijing, leaving one more day for negotiators to reach a deal. Envoys from North and South Korea, the US, Russia, Japan and China failed to reach agreement on Sunday on Pyongyang's demands for a huge transfer of energy aid. The six nations have agreed on most of a plan that would oblige Pyongyang to close nuclear facilities in return for economic and security assurances. The talks have faltered over North Korea's demand for fuel aid, which raised suspicious that it may not fully scrap its nuclear arms capabilities. Christopher Hill, the top US envoy to the talks, said, "We're not looking to provide energy assistance so that they could avoid taking the further steps on denuclearisation." "I think we have a real problem if we can't reach an agreement on this."