"Time is short and every effort must be made to prevent Iran from obtaining a nuclear weapon," President Shimon Peres said on Tuesday as he left for a state visit to Moscow.
The most important of several "critical issues" he would discuss with Russian President Vladimir Putin was Iran, Peres said.
Peres is in Moscow for a four-day state visit, reciprocating Russian Federation President Vladimir Putin's visit to Israel in June for the unveiling in Netanya of a monument to Jewish soldiers who served in the Red Army during World War Two.
On Wednesday, Russia's prestigious Academy of Sciences will grant President Shimon Peres the title of honorary professor, and on Thursday, the Israeli president will join Putin in opening Moscow's new Russian Jewish Museum and Tolerance Center.
After inaugurating the museum, Peres and Putin will sit down for a working meeting in the Kremlin.