China has never promised South Sudan $8-billion in development funds after President Salva Kiir visited Beijing in April, a senior diplomat has said.
Sudan and South Sudan have reached agreements on a demilitarised border zone and oil production but made limited progress on contested areas.
Khartoum's gaping revenue hole has worsened the distrust between the north and south.
South Sudan has said it will pull all police out of a disputed region and is committed to peace, just as Khartoum declares a state of emergency.
Sudanese forces have killed hundreds of South Sudanese during a daylong battle for Sudan's most important oil field, Heglig.
George Clooney was arrested at Sudan's embassy in Washington during a protest against an escalating humanitarian emergency in Sudan.
Actor and activist George Clooney has reiterated his calls for attention to the war between Sudan and newly-independent South Sudan.
The latest talks between Sudan and South Sudan have ended without any deal on the contentious issues of disputed border areas and oil revenue sharing.
Sudan's President Omar al-Bashir strikes a defiant tone after the International Criminal Court issues a warrant of arrest for his defence minister.
Sudan's president has told nearly two million people displaced by conflict in Dafur to leave the refugee camps and return to their villages.
Its archenemy to the north remains hostile, but Africa's newest state is not blameless either.
The ICC says it is reporting Malawi to the UN Security Council for refusing to arrest Sudan's Omar al-Bashir, wanted by the court for genocide.
Gambia's Fatou Bensouda will be elected the ICC's chief prosecutor as the hunt for war criminals and genocidal masterminds becomes more political.
In a new sign of a breakdown in relations, Sudan's Omar al-Bashir has accused South Sudan of betrayal, saying the country was supporting rebels.
Sudan's President Omar al-Bashir arrived in Malawi on Thursday for a regional trade summit, despite the international war crimes warrant against him.
Human Rights Watch has asked Malawi to arrest Sudan's Omar al-Bashir on an international war crimes warrant if he goes to the trade summit this week.
Salva Kiir has lead the first top-level delegation to Khartoum since South Sudan's secession, with key issues like oil and borders on the agenda.
Chinese Foreign Minister Yang Jiechi pledged his country's ongoing support for Sudan, "whatever ... the internal and external changes".
A crowd of about 100 000 gathered at the mausoleum of Sudan People's Liberation Army hero John Garang, to recognise South Sudan's independence.
Omar al-Bashir has said he would take no part in foreign peace talks after South Sudan secedes from the north at the weekend.