ECOWAS is the 44-year-old economic community of West African states. “The evolution of ECOWAS from the level of an organization created for the purpose of economic integration to the level of organizations that makes and implements decisions of a political and economic nature at the international level deserves quite close attention of researchers today.” 
As with any alliance, ECOWAS has the undisputed leader – Nigeria. Nigeria is the most populous country in Africa. It should be noted that for many years it was dominated by a military regime, during which the country was in mismanagement and in disorder. Even under military rule, Nigeria has made a significant contribution to the work of ECOWAS to restore democratic governance and ensure stability in many West African countries. This can be attributed to an attempt by “Nigeria to convince the international community of its determination to return to democratic rule and refrain from participating in difficult West African conflicts.” 
Due to the strategic position, Nigeria plays an important role in realizing the goals and objectives of ECOWAS. First, “Nigeria has a positive balance of payments, because the country exports large quantities of oil and oil products, as well as cocoa and many valuable metals and alloys.”  The second reason is Nigeria’s partners, who make a great contribution to the country’s economy by being its investors. Another important factor is the fact that Nigeria mainly imports high-tech products, without participating in the international exchange of technologies.
At the time of Nigeria’s accession to ECOWAS, the government marked for itself several directions of its activities, being a member of this organization. In the first place, particular attention was paid to adherence to the ECOWAS economic integration framework, as this contributed to the promotion of free trade. In addition, Nigeria has sought to introduce a single currency for the region. The goal of expanding the infrastructural development of the automobile, railway, telecommunications, energy, gas pipeline industries was also important, which, as a result, should have increased agricultural and industrial production.
Thus, it can be concluded that the need for ECOWAS in Nigeria is great because Nigeria, owning financial and human resources, can help the organization achieve its long-term goal of full integration of the region.
According to the Vice President of the World Bank L. Sabib, “Nigeria can become a locomotive capable of promoting the economy of West Africa. This has not yet been done due to poor governance, ineffective government, corruption and political instability”. 
Since the establishment of the Economic Community of West African States (ECOWAS) in 1975, Nigeria has focused on the foreign policy of the West African region. In many ways, this decision allowed it to become one of the decisive forces of this regional organization, not to mention its advantages in its size, geographic location and, of course, economic potential.
Professor Akintola is confident that “Africa has been the focus of Nigeria’s foreign policy since independence, with an emphasis on the liberation, development and unity of Africans both inside and outside the continent.”  This confirms that Nigeria continues to dominate the rest of West African states, which allows it to play an important role in the activities of ECOWAS.
Many researchers highlight the contribution of Nigeria to the regional integration of the ECOWAS organization. Moreover, this activity is a priority for Nigeria in matters of its foreign policy. This is most clearly manifested in the processes of maintaining peace and economic liberalization.
Between 1975 and 1993, Nigeria revised its foreign policy in many ways. This was largely due to the formation of ECOWAS, since the country was striving to significantly increase its weight in this alliance. It should be noted that the change in Nigeria’s policy is closely related to changes in ECOWAS. At the beginning of its work (1975) ECOWAS set itself the task of becoming a collective security organization, but in 1990 the goal was rethought. It was decided to stimulate the development of collective security, and this decision was reflected in Chapter 8 of the UN Charter. 
Nigeria especially showed the importance of its participation in integration during the civil wars in Liberia and Sierra Leone as part of ECOMOG. When Nigeria assumed the role of the dominant country in the organization of ECOWAS, its foreign policy choice was extremely obvious – a peacekeeping strategy.
Speaking about the contribution of Nigeria to the Liberian conflict, it should be said that its participation did not give any guarantees of successful peacekeeping. However, Nigeria’s involvement continued to be critical to the operation. Without Nigerian troops, supplies and air support, ECOMOG forces would have lost many more soldiers and civilians and would most likely be driven out of the country entirely by the factions. Nigeria provided significant military support to ECOMOG, but the motives behind this support hindered ceasefire agreements and further negotiations for a transitional government and elections. Although Nigeria has acquired a certain regional prestige for its actions, it has also generated opposition to its dominant status from neighboring African states.
Nigeria faced major challenges in its efforts to restore peace and security to Sierra Leone with ECOMOG. In addition to financial problems, the lack of support from the citizens of Sierra Leone has also affected the main aspects of peacekeeping in the country. Despite the challenges faced by the Nigerian government and the country’s unstable economic situation, Nigeria was able to continue its mission, which was believed to be in line with the country’s foreign policy goals of ensuring peace and security in the subregion and Africa as a whole. Despite the enormous government spending and corruption associated with Nigeria’s mission to Sierra Leone, the mission remains one of the most successful African initiatives to promote peace and security abroad.
The role of Nigeria in the implementation of the ECOWAS plans cannot be overestimated because it has the status of a regional leader in ECOWAS, which indicates its serious contribution to the processes of regional integration and the maintenance of peace and security in West Africa
1. Asiagba John Chinedu. Nigeria as a member of the Economic Community of West African States, p. 261.
2. ECOWAS. Regional integration problems. Managing editor A.Y. Elez. Moscow., IAfr RAN., 2016.p. 5
3. Geveling, L.V. Foreign experience in fighting corruption: Federal Republic of Nigeria / L.V. Geveling // Institute of Municipal Administration. – 2012.- № 3.- p. 98-102.
4. Omo. O. O. Dennis. Nigeria in the Process of Regional Integration in West Africa: The Case of ECOWAS. Moscow,2018., p. 67.
5. Speech delivered by World Bank Vice President Louis Sabib, state visits to Nigeria // The Guardian Newspaper. Lagos, 1998 September 21.