Egypt should take additional measures to step up security of foreign embassies on its territory, the Russian Foreign Ministry said on Sunday.
Israel is now facing its worst crisis with Egypt for 30 years after a violent mob stormed of its embassy in Cairo on Friday. The clashes outside the embassy followed a mass protest in Tahrir Square, the center of February's revolution, after Friday prayers.
The crowd broke away to march to the Israeli embassy three weeks ago after five Egyptian security officers were killed by Israeli forces in the aftermath of a militant attack on the Egypt-Israel border which left eight Israelis dead.
The siege of the embassy ended only after intervention from the White House following phone calls between the Israeli prime minister, Benjamin Netanyahu, and United States President Barack Obama.
More than 1000 people, including 300 policemen, were injured in the unrest, which continued through the night as authorities struggled to get a grip on the anti-Israeli protests.
"Moscow is deeply concerned over the incident and urges the parties [of the conflict] to show restraint and refrain from further escalation of the tensions," the Russian statement said.
Catherine Ashton, the European Union's foreign policy chief, said in a statement: "We trust that this regrettable incident is an isolated event and that the authorities will take the necessary measures to normalize the situation."