FRENCH FORCES PREPARE TO ENTER RWANDA Foreign Legion units and French marines massed along Rwanda's border with Zaire yesterday as rebels issued new warnings that France's humanitarian mission would be treated as an invasion and resisted. French officials, meanwhile, urged more international backing for the virtually solo foray into Rwanda, and new voices were raised, urging caution or withdrawal. The first 600-man spearhead of 2,500 troops marked for the operation still had not crossed into Rwanda yesterday, French military authorities saidat press time. The troops, dispatched from bases in the Central African Republic, got into position as soon as the UN Security Council gave its approval Wednesday. Veterans at quelling trouble in French-allied African nations, these units have been increasingly used in humanitarian operations in recent years. Rail protest in Seoul
Hundreds of thousands of commuters were stranded yesterday in Seoul when railroad engineers refused to work to protest the predawn arrests of 613 colleagues. Subway and other unions threatened sympathy strikes, and some 700 students clashed with riot police after a sympathy rally. Subway workers in Seoul and Pusan, the country's two largest cities, decided to advance the start of their own planned strikes to today from Monday. Rail workers are demanding raises of up to 14.5 percent. Management has refused to give more than 3 percent. Guatemala peace talks
The Guatemalan government and leftist guerrillas meeting in Oslo agreed yesterday to set up a human rights commission, a crucial step toward ending a civil war there, a United Nations mediator said. Both the government and the guerrillas aim to sign a complete peace accord in late 1994. Probe of tobacco firms
The Justice Department is reviewing allegations that tobacco company executives may have lied to regulators and Congress in recent testimoney, Attorney General Janet Reno said yesterday. ``We're looking at all the allegations, all the comments, all the information that we have received to determine what would be the appropriate action by the Justice Department in terms of a variety of issues,'' Ms. Reno said. Miami faces student flood
Immigrant students will temporarily attend classes in malls, movie theaters, and offices - apart from other schoolchildren - if Dade County schools are flooded by families from Cuba, Haiti, and other countries. The plan approved Wednesday by the school board would take effect if the district starts to enroll more than 100 children a day beyond typical enrollment projections.