Ministry of Defence looks after the defence of the EUFN alliance. It will discuss about declaring wars and can urge the President and or Prime Minister to declare or not to declare war. Although the head of state aka President will have the final say. If the MoD dont like it they bring the case to the council and if they decided against the President then they can overule me and the Prime Minister to which a snap elections take place. Also in more simple way about the increase of the power, if the President and or the Prime Minister want the EUFN as a whole go to war then they need the backing of the MoD.