>> Russia might have violated a UN resolution for this action, its first bombing run on Syrian targets from an Iranian airbase. The US State Department claiming Moscow might be contravening a UN ban on the supply, sale, or transfer of combat aircraft to Iran. It's an issue their lawyers will look into.
Reuters Deputy Moscow Bureau Chief, Andrew Osborn, says Russia doesn't agree.>> Russian Foreign Minister Sergei Lavrov has come out and totally rejected that, very angrily rejected that. He says that Russia is simply flying bombing missions from Iran into Syria and that that in no way breaks or violates this UN resolution.
>> Moscow only began armed sorties from the base on Tuesday and appears keen to play this allegation down as political posturing from the US. But Russian aircraft in Iran is undoubtedly a strategic sea change in the Syrian conflict, militarily allowing for shorter flying times and higher payloads. But the greatest bombshell may be diplomatic.
>> The greatest significance that we should perhaps attach to this decision to use Iran is really that Russia is showing that, yes, you know what, we are now increasing our role In the Middle East, in Syria, even more. So it has a symbolic importance. It's sending a message, to the West in particular, that Moscow sees itself as an even bigger player in the Middle East and in the Syria peace process.
>> In the short term, it may also torpedo US-Russian talks. They're taking place behind closed doors to increase cooperation in the fights against Islamic State in Syria.
But this latest public spat highlights yet another difference they must first ovecome.