Democratic Republic of the Congo army soldiers this week battled a renegade army faction near the eastern town of Bukavu, shattering a fragile truce struck early this morning after the commander of the renegade group received assurances that the government would protect a group of ethnic Tutsis in the region. Clashes in eastern D.R.C. have killed at least 45 people since Wednesday, including a U.N. peacekeeper. The fighting between the renegade and regular forces resumed near the Bukavu airport, 15 miles north of the South Kivu provincial city, when the commander of the regular forces launched a fresh attack, according to unidentified security officials.