The United States wants to introduce a UN Security Council resolution next week to send a "strong message of deterrence" to Zimbabwean President Robert Mugabe, US Secretary of State Condoleezza Rice said Saturday.
"I understand that the United States mission to the UN is working with others on next steps, including perhaps on what kind of resolution the Security Council might wish to adopt," Rice told reporters travelling with her to Seoul.
"We will pursue that. at the beginning of next week," she said.
"I think we will have to look to see what other measures are available, both to the United States and to the international community more broadly, to send a strong message of deterrence," Rice said.
"The US has already put in place a wide range of sanctions. I think we will have to look to see if there are more."
On Friday the Security Council failed to agree on a statement declaring Zimbabwe's run-off election illegitimate in the face of South African opposition, merely issuing an oral statement of regret.
Rice said her Africa envoy Jendayi Frazer will join an African Union meeting in the Egyptian resort of Sharm El-Sheikh on Monday. "I hope there will be equally strong statements coming out of the AU," she said.
The United States and European Union have condemned Friday's vote in Zimbabwe as a "sham" and the major powers said it would not be recognised.
Mugabe was assured of victory as the sole candidate following a boycott by opposition leader Morgan Tsvangirai.
Tsvangirai, the winner of the first round on March 29, refused to take part in Friday's run-off after a wave of deadly attacks on his supporters.