(FOX NEWS) As he touched down in St. Petersburg on Thursday morning, President Obama greeted his host Vladimir Putin with a handshake and a smile.

But the cordial greeting belies the tinderbox the two leaders are sitting on, as they posture and deliberate over a potential U.S. strike on Syria — one of Russia’s closest Mideast allies.

Putin escalated concerns about the fallout from any strike when he indicated in an interview published Wednesday that his country could send Syria and its neighbors in the region the components of a missile shield if the U.S. attacks.

Should Congress give Obama authority to attack Syria?

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