Russian President Dmitry Medvedev made the pledge during their talks Tuesday in the Black Sea resort of Sochi, Peres said.
"President Medvedev gave a promise he will reconsider the sales of S-300s because it affects the delicate balance which exists in the Middle East," Peres told reporters via video link from Sochi.
A Kremlin spokesman wouldn't immediately comment on Peres' statement.
Russia has signed a contract to supply the powerful S-300 missiles to Iran, but has dragged its feet on delivering them.
Israel and the United States fear that Iran could use the missiles to protect its nuclear facilities -- including the uranium enrichment plant at Natanz or the country's first atomic power plant, which is being completed by Russian workers in Bushehr. That would make a military strike on the Iranian facilities much more difficult.
Published by Mike Hitchen,
Putting principles before profits
Israel Russia Iran Dmitry Medvedev Shimon Peres Nuclear Issues Arms Defense
Putting principles before profits
Israel Russia Iran Dmitry Medvedev Shimon Peres Nuclear Issues Arms Defense