If this deal goes through, Assad's days in power may be numbered.

Reuters:

Reuters:Saudi Arabia has offered Russia economic incentives including a major arms deal and a pledge not to challenge Russian gas sales if Moscow scales back support for Syrian President Bashar al-Assad, Middle East sources and Western diplomats said on Wednesday.

The proposed deal between two of the leading power brokers in Syria's devastating civil war was set out by Saudi intelligence chief Prince Bandar bin Sultan at a meeting with Russian President Vladimir Putin in Moscow last week, they said.

Russia has supported Assad with arms and diplomatic cover throughout the war and any change in Moscow's stance would remove a major obstacle to action on Syria by the United Nations Security Council.

Syrian opposition sources close to Saudi Arabia said Prince Bandar offered to buy up to $15 billion of Russian weapons as well as ensuring that Gulf gas would not threaten Russia's position as a main gas supplier to Europe.

In return, Saudi Arabia wanted Moscow to ease its strong support of Assad and agree not to block any future Security Council Resolution on Syria, they said.

A Gulf source familiar with the matter confirmed that Prince Bandar offered to buy large quantities of arms from Russia, but that no cash amount was specified in the talks.

One Lebanese politician close to Saudi Arabia said the meeting between Bandar and Putin lasted four hours. "The Saudis were elated about the outcome of the meeting," said the source, without elaborating.

Putin's spokesman, Dmitry Peskov, could not immediately be reached on Wednesday for comment about the meeting. A Saudi Foreign Ministry official was also not immediately available to respond.

Putin's initial response to Bandar's offer was inconclusive, diplomats say. One Western diplomat in the Middle East said the Russian leader was unlikely to trade Moscow's recent high profile in the region for an arms deal, however substantial.

He said Russian officials also appeared skeptical that Saudi Arabia had a clear plan for stability in Syria if Assad fell.

However, in a possible sign of greater flexibility by Moscow, other diplomats said that in the run-up to the meeting Russia put pressure on Assad to allow in a U.N. mission to investigate the suspected use of chemical weapons.

It doesn't sound promising, but Assad is becoming a drag on Putin's diplomacy elsewhere - including with the US and western Europe. China is already wavering after the UN investigation revealed Assad's use of chemical weapons. The pro-Assad bloc at the UN hasn't been tested in months and there may be a sanctions formula that Putin would accept.

What's really needed is for Putin to stop resupplying Assad's army. Iran can't do it by itself, which means the offensive currently underway by Assad's forces would lose steam and perhaps even be halted if the Russians choke off the arms pipeline.

Where's the US in all of this? I don't know, but Obama sure looked good on Leno last night, didn't he?