World Trade Organization director-general Ngozi Okonjo-Iweala urged trade ministers gathering in Geneva to go the extra mile over the coming days and said she would consider one or two global trade deals a success.

"Let me be clear, even landing one or two will not be an easy road. The road will be bumpy and rocky. There may be a landmine along the way," she told a news conference before the start of the ministerial conference on Sunday.