9 a. anticipate and prevent disputes and conflicts, as well as policies that may lead to genocide and crimes against humanity; b. undertake peace-making and peace-building functions to resolve conflicts where they have occurred; c. authorize the mounting and deployment of peace support missions; d. lay down general guidelines for the conduct of such missions, including the mandate thereof, and undertake periodic reviews of these guidelines; e. recommend to the Assembly, pursuant to Article 4(h) of the Constitutive Act, intervention, on behalf of the Union, in a Member State in respect of grave circumstances, namely war crimes, genocide and crimes against humanity, as defined in relevant international conventions and instruments; f. approve the modalities for intervention by the Union in a Member State, following a decision by the Assembly, pursuant to article 4(j) of the Constitutive Act; g. institute sanctions whenever an unconstitutional change of Government takes place in a Member State, as provided for in the Lomé Declaration; h. implement the common defense policy of the Union; i. ensure the implementation of the OAU Convention on the Prevention and Combating of Terrorism and other relevant international, continental and regional conventions and instruments and harmonize and coordinate efforts at regional and continental levels to combat international terrorism; j. promote close harmonization, co-ordination and co-operation between Regional Mechanisms and the Union in the promotion and maintenance of peace, security and stability in Africa;