Russia on Tuesday ordered the expulsion of an alleged American CIA agent working undercover at the U.S. embassy who was discovered with a large stash of money trying to recruit a Russian agent.

Russia's Federal Security Service (FSB, ex-KGB) identified the man as Ryan C. Fogle -- third secretary of the political section of Washington's embassy in Moscow -- and said he had been handed back to the embassy after his detention.

Israeli Prime Minister Benjamin Netanyahu is to hold talks on Tuesday with Russian President Vladimir Putin on the conflict in Syria, the Kremlin said, amid concerns Moscow plans to deliver advanced missiles to the Damascus regime.

"During the meeting an exchange of opinion is planned on key aspects of bilateral ties," the Kremlin said in a statement.

Israeli Prime Minister Benjamin Netanyahu will visit Russia for talks with President Vladimir Putin, officials said Saturday, amid concerns Moscow may be about to deliver advanced missiles to Syria.

Putin's spokesman Dmitry Peskov confirmed the visit to Agence France Presse, but declined to give details, although he told the Interfax news agency it was being planned for next week.

British Prime Minister David Cameron and Russian President Vladimir Putin on Friday discussed joint options for ending the crisis in Syria amid a new diplomatic push to resolve the two-year conflict.

Cameron's rare call on Putin at his summer vacation residence in the Black Sea resort of Sochi came three days after top U.S. and Russian diplomats agreed to make a joint effort in search of a solution.

Russian Prime Minister Dmitry Medvedev on Thursday appointed former Kremlin foreign policy adviser Sergei Prikhodko as the head of his government's administration following the sudden departure of Deputy Prime Minister Vladislav Surkov.

Prikhodko worked as Medvedev's foreign policy adviser when he served as president between 2008 and last year.

U.S. President Barack Obama will meet British Prime Minister David Cameron at the White House on Monday to discuss Syria and the G8 summit next month in Northern Ireland, officials said.

"The prime minister's visit underscores the special relationship between the United States and the United Kingdom that has been crucial in advancing our shared security and prosperity," a White House statement said.

U.N.-Arab League envoy to Syria Lakhdar Brahimi on Wednesday "warmly welcomed" an agreement between the United States and Russia to pressure both sides in Syria to end the bloodshed, a statement from his office said.

"This is the first hopeful news concerning that unhappy country in a very long time," it said. "The statements made in Moscow constitute a very significant first step forward. It is nevertheless only a first step."

Russia and the United States agreed at top-level talks on Tuesday to push both the Syrian regime and rebels to find a political solution to their conflict and to hold an international peace conference, the Russian foreign minister said.

"We agreed that Russia and the United States will encourage both the Syria government and opposition groups to find a political solution," Foreign Minister Sergei Lavrov said after talks with U.S. counterpart John Kerry in Moscow.

U.S. Secretary of State John Kerry arrived in Moscow Tuesday for talks with Russian President Vladimir Putin, seeking to restore frayed U.S.-Russia ties and win Moscow's support on the war in Syria.

Kerry is making his first trip to Russia since taking over as the chief U.S. diplomat in February, on what is one of his most diplomatically delicate missions to date.

Thousands of protesters on Monday filled a square in central Moscow to denounce Russian President Vladimir Putin one year into his new Kremlin term, as the opposition seeks to recover the momentum of their challenge to his rule.

Organizers said tens of thousands attended the rally, which marks one year since a chaotic May 6, 2012 anti-Kremlin protest that descended into violence, and Putin's return to the presidency a day later. Police estimated the numbers at 7,000.