Turkish President Recep Tayyip Erdogan is separately meeting top EU officials in Brussels on Monday for talks dominated by the migrant crisis and the deepening conflict in Syria where he has backed rebels seeking the ouster of long-time Russian ally President Bashar al-Assad.
The Arch of Triumph was one of the most recognisable sites in Palmyra, which the IS group seized in May. The monumental arch sat atop the famed colonnaded streets of the ancient city, which linked the Roman Empire to Persia.
A year-long air campaign by Western and Arab air forces in Syria and Iraq had been counterproductive, Assad said, helping terrorism spread and win new recruits, but a coalition of Syria, Russia, Iran and Iraq could achieve real results.
French Prime Minister Manuel Valls urged Russia on Sunday to direct air strikes at Islamic State jihadists alone in Syria, as the West raises concerns Moscow will target moderate rebel groups opposed to Syria's president.
Russian jets launched a fourth day of air raids in Syria on Saturday, a monitor said, hitting the Islamic State group's main stronghold after claims Moscow was instead targeting moderate rebel factions.
Referring to his meeting with Putin early this week, Obama told a press conference yesterday that he told Putin that it is true that the two countries and the entire world have a common interest in destroying the dreaded Islamic State militant group (ISIS).
With Russian warplanes bombing Syria for a third day, French President Francois Holland has told President Vladimir Putin that Moscow's airstrikes must be confined to attacking Islamic State militants, not other rebels opposing the Damascus government.