BOSNIA PEACE PLAN IMPERILED A day after Muslims rejected a Western proposal for safe havens, Bosnian Serb leader Radovan Karadzic yesterday opposed posting foreign troops on Serb territory to monitor the plan. The Yugoslav news agency Tanjug quoted Mr. Karadzic as saying the Serbs would not accept an outside international military force because it would violate the sovereignty of the self-proclaimed Bosnian Serb state. He had supported the plan Sunday. Bosnia's Muslim president, Alija Izetbegovic, rejected the peace formula Sunday, ca lling it an attempt to herd his people into "reservations". The reaction from Mr. Izetbegovic and Karadzic could hold up the plan announced in Washington on Saturday by the United States, Russia, Britain, France, and Spain. US Supreme Court
In a series of decisions yesterday the court:
* Refused to block a retrial of lawyer E. Robert Wallach, accused of taking payoffs from Wedtech Corporation to lobby his friend, former Attorney General Edwin Meese. The court, without comment, rejected Mr. Wallach's arguments that prosecutors knowingly allowed a witness to lie during his first trial, and that they failed to prove he defrauded Wedtech.
* Refused to stop an appellate court's investigation of John Demjanjuk's extradition to Israel, where he has been sentenced to death as Nazi death-camp guard "Ivan the Terrible." The justices, without comment, turned down the appeals of two former US Nazi hunters who say the appellate court is overstepping its authority.
* Let stand a ruling that could force the Virginia Military Institute to admit women or give up its state financial support. The court, without a recorded dissent, rejected the military college's argument that its male-only policy is constitutional because it promotes educational diversity.
VMI and The Citadel, both military schools, are the nation's only all-male, state-supported schools. The Citadel policy is also under legal attack. Peru clashes
A jungle clash between Peruvian soldiers and pro-Cuban rebels left 11 dead, and Maoist guerrillas attacked a bank and burned buses in Lima, police and news reports said Sunday.
The government on Saturday prolonged for 60 days a state of emergency in Lima, giving police control over the city.
Shining Path guerrillas dynamited a bank and burned four buses in different parts of Lima on Saturday night, police said. Tibet protests
Several thousand Tibetans protested in Lhasa Monday against Chinese rule of the Himalayan region, Western travelers there said by telephone.
The travelers said the demonstration began peacefully in the afternoon as a protest ostensibly against rising prices and rents.
Periodic protests demanding independence shake Tibet, but they are usually quickly quelled by Chinese police backed by a strong military presence. Shooting trial
In Baton Rouge, La., a man who mistook a lost Japanese exchange student for a burglar and shot him dead was acquitted of manslaughter in a case that stoked Japan's image of the United States as a violent nation rife with guns.
A jury deliberated about three hours Sunday before finding Rodney Peairs acted reasonably in firing at 16-year-old Yoshihiro Hattori. The teen-ager mistakenly went to Peairs' door Oct. 17 while looking for a Halloween party.
The case caused outrage in Japan, where owning a gun is against the law, with a few limited exceptions. Germany's asylum policy
The lower house of the German parliament votes tomorrow on whether to end Germany's open-door policy for asylum-seekers, adopted after World War II in atonement for Nazi persecution of foreigners. If it passes, the bill goes to the upper house Friday for final approval, then would become law on July 1.
Some protests are planned and there is some wavering among legislators, but the measure is expected to pass. Voter impatience with a nonstop flood of asylum-seekers is cited as a key reason.