The formal and final transfer of the Strip from Libya to Chad took place on May 30, when the sides signed a joint declaration stating that the Libyan withdrawal had been effected.
[122] Despite these strains, however, Nigerians had assisted in the halting process of achieving stability in Chad, and both nations reaffirmed their intention to maintain close ties.
[122] Both countries established diplomatic relations on 15 March 1961[123] On December 24, 2005, Chad declared itself as in a "state of belligerance" with neighboring Sudan.
[124] Chad broke diplomatic relations with Sudan at least twice in 2006 because it believed the Sudanese government was supporting Janjaweed and UFDC rebels financially and with arms.
On May 11, 2008, Sudan announced it was cutting diplomatic relations with Chad, claiming that it was helping rebels in Darfur to attack the Sudanese capital Khartoum.
The U.S. Agency for International Development (USAID) and the U.S. Information Service (USIS) offices resumed activities in Chad in September 1983.
The United States Department of State issued a travel advisory to U.S. citizens in 2009, recommending that citizens not affiliated with humanitarian efforts avoid all travel to eastern Chad and the Chad/Central African Republic border area due to insecurity caused by banditry, recent clashes between Chadian government and rebel forces, and political tension between Chad and Sudan.
[139] President Donald Trump issued a proclamation on September 24, 2017, suspending the entry of Chadian nationals to the United States.
[122] In addition, as a northern Muslim, Habré represented a constituency that favored Afro-Arab solidarity, and hoped Islam would provide a basis for national unity in the long term.
[122] In contrast, numerous other Arab states opposed the Libyan actions,[150] and expressed their desire to see the dispute over the Aouzou Strip settled peacefully.
Although oil output to the West has resumed and the dispute has officially been resolved, resentment towards what the Déby administration considered "foreign meddling" lingers.
Both countries established diplomatic relations on 12 August 1960[175] France was Chad's most important foreign donor and patron for the first three decades following independence in 1960.
[122] At the end of the 1980s, economic ties were still strong, and France provided development assistance in the form of loans and grants.
[122] Chad's dependence on France declined slightly during Habré's tenure as president, in part because other foreign donors and investors returned as the war subsided and also because increased rainfall since 1985 improved food production.
[181] In November 2007, Romania announced that they would deploy 120 troops to Chad and the Central African Republic in connection with a European Union peacekeeping mission there.
[183] However, by mid-2008, Romanian defence minister Teodor Meleşcanu indicated that his country would not send further troops to the mission in Chad, stating that they had reached their limits and did not want involvement in a war theatre.