The prices of staples and grains have increased significantly in local markets in Nigeria. This increase has had a substantial impact on food availability in the country. The prices of agricultural machinery, chemicals, and fertilizers have also risen significantly between 2022 and 2024. This increase is linked to Russia's invasion of Ukraine in February 2022. Russia and Ukraine have been major exporters of grains and staple products to West Africa, particularly Nigeria. Nigeria and most West African countries rely heavily on grains from Russia and Ukraine for food security. This study seeks to investigate the impacts of the Russia-Ukraine war on food security and examine ECOWAS interventions to address food security challenges in Nigeria. The study relied on a mixed-method research design, combining primary and secondary data for its analysis. The findings indicate that the Russia-Ukraine war has affected food prices, the costs of food logistics, fertilizers, and other agricultural products. The war has also led to the destruction of climate and food storage facilities that support food production, disruptions in international food logistics, and the displacement of farmers. The study recommends the intervention of the United Nations to ensure the reinstatement of the Black Sea Grain Initiative and calls for the stabilization of ECOWAS member states to reduce military interference in governance and promote good governance.