WEST Africa's main regional bloc has imposed sanctions against the junta in Guinea and those slowing Mali's post-coup transition - its toughest response yet to a run of military takeovers. The move was agreed at an emergency summit of the Economic Community of West African States (ECOWAS) in Accra to respond to last week's putsch in Guinea and perceived slow progress towards constitutional rule in Mali following a coup last year. Regional heads of state decided to freeze the financial assets and impose travel bans on Guinea's junta members and their relatives, insisting on the release of President Alpha Conde…