(Bloomberg) — Ethiopia’s main opposition grouping disputed a government claim that political opponents of Prime Minister Meles Zenawi’s ruling party are colluding with the country’s arch-enemy, Eritrea. State radio reported yesterday that the opposition is “covertly and overtly” collaborating with neighboring Eritrea ahead of elections on May 23. Ethiopia and Eritrea fought a 1998-2000 border war that left as many as 70,000 people dead and the two countries’ armies remain deployed along their border.