[1] Emperor Haile Selassie, who had been in exile during the 1936–41 Italian occupation of Ethiopia, returned with the help of Ethiopian, British, and Sudanese forces from Sudan.

[1] Relations became tense again in the late 1950s as Ethiopia supported the South Sudanese Anya Nya rebels in their battle against Khartoum.

[1] Selassie, however, helped broker the 1972 Addis Ababa Agreement that ended the first civil war between North and South.

[1] This era of cooperation faded quickly as Islamic militants in Sudan tried to export their ideas to neighboring countries, including Ethiopia.

[1] Sudan's relations with Ethiopia reached a low in 1995 following Sudanese complicity in the attempted assassination of Egyptian president Hosni Mubarak as he was visiting Addis Ababa.

[1] The two nations signed an agreement ending a dispute involving their 1,600-kilometer border, and landlocked Ethiopia made plans to make greater use of Port Sudan as a transshipment point.

[1] Ethiopia, Sudan, and Yemen formed a regional group early in 2003 that they said was designed to “combat terrorism” in the Horn of Africa.

[1] The Ethiopian prime minister and Sudanese president inaugurated a major new road link between Ethiopia and Sudan at the end of 2007.

[1] Agreement on usage of Nile River water reemerged as an important issue between Addis Ababa and Khartoum, while Asmara supported the Sudanese position as another way to irritate Ethiopia.