World IN BRIEF : RUSSIA : Yeltsin Said to Need Long Convalescence

President Boris N. Yeltsin’s health has improved since he suffered a mild heart attack last week, but his doctors say he should spend at least three weeks in the hospital, then two weeks in a sanatorium, the Itar-Tass news agency said. Seeking to ease fears over the 64-year-old Kremlin leader’s health, Naina Yeltsin said her husband is on the mend and Prime Minister Viktor S. Chernomyrdin said the president is making all major national decisions. Sources at Moscow’s Central Clinic Hospital said there were “clear signs of improvement.” The hospital sources told Tass that Yeltsin’s recovery will take so long because he failed to complete his treatment after his first mild heart attack, in July.