PROBLEMS ON EVE OF NUCLEAR SUMMIT.

U.S. officials, said to be lowering expectations before the April 19-20 nuclear security summit in Moscow, claimed April 12 that Moscow and Washington remain deadlocked on several key issues and that a major breakthrough at the summit is unlikely. According to one U.S. scientist, the main stumbling block involves differences over the disposal of plutonium. The United States favors burying it, while Moscow prefers to burn it in reactors. (AP, April 12) (See also "News & Perspective" section below)

Has Yeltsin Accepted NATO?