ABUJA, May 25 (AFP) - Democracy should be made a condition of membership of the Organisation of African Unity (OAU), former Tanzanian president Julius Nyerere said here Tuesday. Speaking after a meeting with Nigeria's president-elect, Olusegun Obasanjo, Nyerere said the principle of non-interference in other countries affairs was used for too long as an "alibi" for not pushing demands for democracy. "The principle of non-interference in the internal affairs of member states became an alibi," the former president said. "We used it not to defend the right of the people of our states to elect their leaders freely and without external interference. We the heads of state of the countries of the OAU used it to defend each other," he continued. "The OAU should no longer tolerate so-called heads of state and government whose only credential is that they assassinated the duly elected head of state of the country. "They should be excluded from future meetings of the OAU, including the summit." "Henceforth," he said, "let Nigeria, and every country in Africa, be represented at the OAU by a freely elected head of state or government. Let the OAU be a body that brings together the democratically elected." Nigeria will Saturday return to civilian elected rule after 15 years of military regimes. Meeting in Lome Tuesday, the 16-member Economic Community of West African States (ECOWAS), one of the main sub-regional bodies in Africa, agreed to recognise the new strongman of the Republic of Niger, Major Daouda Wanke. Wanke took power in April after his predecessor, president Ibrahim Bare Mainassara was assassinated by his presidential guard, controlled by Wanke.  