JERUSALEM — Mahmoud Abbas, the president of the Palestinian Authority, and President Vladimir V. Putin of Russia may have more in common than an interest in Middle East peace talks. According to a newly discovered Soviet document, Mr. Abbas may have once worked for the K.G.B., too.

The possibility, trumpeted by the Israeli media on Wednesday night and just as quickly dismissed by Palestinian officials, emerged from a document in a British archive listing Soviet agents from 1983. A reference to Mr. Abbas is tantalizing but cryptic, just two lines identifying him by the code name “Mole.” At the end of his entry are two words: “K.G.B. agent.”

The suggestion that Mr. Abbas may have been on Moscow’s roster more than three decades ago might have been just a historical curiosity but for the fact that it comes at the same time that Mr. Putin has been trying to organize new talks between Mr. Abbas and Prime Minister Benjamin Netanyahu of Israel. A Russian envoy was in Jerusalem this week to meet with Mr. Netanyahu, but the Israeli and Palestinian leaders remain at odds and no direct talks appear imminent.

“We thought it was important now in the context of the Russian attempt to arrange a summit between Abbas and Netanyahu, particularly because of Abbas’s joint K.G.B. past with Putin,” said Gideon Remez, one of two researchers at the Truman Institute at Hebrew University of Jerusalem, who found and disclosed the Soviet document to Israel’s Channel 1. (At the end of the Soviet era, Mr. Putin was a K.G.B. lieutenant colonel.)