UN Warns of Action Against Angola Sanction-Busters By Evelyn Leopold UNITED NATIONS (Reuters) - The U.N. Security Council pledged on Tuesday to consider action in six months against nations violating arms, diamond and fuel sanctions against Angola's UNITA rebels. But its resolution, adopted by a 15-0 vote, does not specifically threaten sanctions against the sanctions-busters and France rejected imposing them on countries in the future. The seven-page document, the subject of heated debate in private meetings, would continue investigations about how the rebels were able to fuel their war machine and consider additional curbs against UNITA. The resolution asks Secretary-General Kofi Annan to establish a ``monitoring mechanism'' of up to five experts to collect additional information and report to the council by Oct. 18. A month later the council would decide whether to take action against violators. Last month, a ground-breaking U.N. report by an independent panel revealed how UNITA imported arms from Bulgaria, using South African weapons brokers, Belgian diamond merchants, and African leaders, bribed with diamonds, to circumvent the bans. The council in 1993 imposed an arms and fuel embargo on UNITA, the National Union for the Total Independence of Angola, in an effort to end a 25-year-old civil war in the former Portuguese colony that has killed about 500,000 people.