July 9, 1982

International A key foreign policy review is under way in the Reagan Administration, according to authoritative Administration officials. They said President Reagan was seeking a possible way to ease the economic sanctions imposed against Poland and the Soviet Union over the military crackdown in Poland, including a scaling back of the ban on equipment for the new natural gas pipeline from Siberia to Western Europe. (Page A1, Column 6.) Moscow warned Washington that it would shape its policy ''with due consideration'' of any dispatch of American troops as part of a multinational force to evacuate Palestinian guerrillas from west Beirut. The Soviet press agency Tass said the statement had been made by Leonid I. Brezhnev, the Soviet leader, in his latest letter to President Reagan. (A1:4.)

The Argentine defense on the Falkland Islands was undermined by poor leadership and corruption that left many soldiers sick and hungry and with faulty weapons, according to many of the returning soldiers. Soldiers who fought on the front lines said many of their officers had deserted them. Some told of demoralized fellow soldiers - most of them teen-age draftees with only a few months' service -shooting themselves in the foot in order to be withdrawn. As the accounts of the returning soldiers have spread, often repeated in interviews with the press, so have calls for an inquiry into the war. According to some soldiers, the army has tried to silence them by threatening them with dishonorable discharges or extended draft service if they talk to the press.

''In connection with statements to the effect that the United States is prepared in principle to send a contingent of American troops to Lebanon, L.I. Brezhnev warned the United States President that, if this really took place, the Soviet Union would build its policy with due consideration of this fact.'' - Statement by Tass, the Soviet Government's press agency. (A6:4.)

Leonid I. Brezhnev has sent a letter to President Reagan saying that, if the United States sent troops to Lebanon, the Soviet Union would ''build its policy with due consideration of that fact.'' Text of Tass announcement, page A6. The letter, reported today by Tass, the Soviet Government's press agency, was reportedly delivered in Washington Wednesday by Ambassador Anatoly F. Dobrynin. It was the latest of a series of exchanges on Lebanon between the Soviet and American leaders.

In an unexpected move, the New York City Opera announced yesterday a consolidation of its fall and spring seasons at the New York State Theater into one season extending from July until December. This will mean elimination of the traditional spring season as of 1983. Company officials stressed that the decision will not reduce the number of performances annually in New York City, but only rearrange those performances into one season. No plans have been announced for the company in the winter and spring months, or for the rental of the State Theater in March and April.