At a conference that drew a roll-call of the Islamist leaders who have gained influence in the wake of Arab Spring revolts, Hamas leader Khaled Meshaal won a noisy welcome and pledges of support on Thursday.
Two Iranian warships docked in Sudan on Monday, Iran's official IRNA news agency reported, less than a week after Khartoum accused Israel of attacking an arms factory in the Sudanese capital.
The Israeli army has declined to comment on a report that it had launched two air strikes in Sudan over the past two months.
A Sudanese government minister threatened to strike Israel, and the country called on the United Nations Security Council to condemn Israel, over the bombing of a weapons factory in Khartoum.
When Egyptian President Gamal Abdel Nasser swept into Khartoum for an Arab summit less than three months after the Arab debacle in the 1967 Six-Day War, he was greeted like a hero.
Newsweek ran a cover story titled, "Hail to the Conquered!" The summit passed the notorious "three no's" defining future relations with Israel: No negotiations, no recognition and no peace.
In July the following year, Nasser took a young Yasser Arafat, traveling on an Egyptian passport under the name of Muhsin Amin, with him to Moscow on an arms shopping spree.