Soviet leader Leonald I. Brezhnev offered conciliatory words today to visiting Syrian Prsident Hafer Assad in the first top-level meeting between the two nations since Syria's intervention in the Lebanese war.

Soviet-Syrian friendship, which has been strained since the intervention last June, "will go on, developing and strengthening," Brezhnev said.

"The Soviet side has done and is doing everything to strengthen cooperation with Syria along all lines," he said.

"It is important to think together and consistently about the prospects and the deepening of bilateral Soviet-Syrian relations in evry field, and also baout concerted actions in regard to topical, international problems, above all the Middle East probelm," the Soviet Communist Party leader said.

Assad said, at a Kremlin banquet tonight that the situation in the Middle East remained serious because of Israeli "intransigence."

He said, however, that he hoped that the talks in Moscow would help to establish a "a just and total peace" and he added that he foresaw permenent stability soon in southern Lebanon.

Assad arrived in Moscow for what is formally described as an "official friendly visit," his first here since October 1975.

He just met with a top Soviet official when Premier Alexel N. Kosygin visited Syria last June. It was during that visit that Assad moved his tanks into Lebanon, despite Soviet calls for foreign noninterference in the conflict.

In the months that followed, the Kremlin began to criticize its once-close friend.

Brezhnev noted that events in the Middle East have "developed stormily, frequently taking a dramatic turn." But he said Soviet-Syrian friendship would continue.

Brezhnev reiterated the Soviet Union's "firm stand" that the Palestine Liberation Organization should take part in Mideast talks "on a full-fledged basis.