Israel is trying to halt Russia selling advanced anti-aircraft missiles to Syria, fearing they could fall into the hands of Lebanese militants.
Israeli officials acknowledged today that there is tension between Israel and Moscow and a deputy Russian foreign minister is in the region to discuss the matter.
Asked about the deal, Israeli Foreign Minister Mr Silvan Shalom said: "We have close contacts with the Russians. We had consultations over the past few days, and we hope to reach the necessary agreement."
The United States is aware of the growing crisis between Russia and Israel, the officials said, and Israel may get Washington directly involved to halt the sale of Igla SA-18s to Syria, they said.
"We have enough problems on the ground with Syria and we don't need more problems from the sky," said deputy leader Mr Shimon Peres.
The Igla SA-18s are one of the most sophisticated shoulder-held anti-aircraft missiles available. Because of their simplicity, light weight and a built-in training system, they are also an ideal weapon for militants, military analysts said.
Israeli officials said the deal was signed several days ago. They are worried that the anti-aircraft missiles would reach Lebanon's Hezbollah guerrillas who have attacked Israel's northern border. The United States could be concerned they would reach Iraqi insurgents, analysts said.