Russia on Tuesday warned Saudi Arabia against supplying Syrian rebels with shoulder-launched missile launchers, saying such a move would endanger security across the Middle East and beyond.
The Russian foreign ministry said in a statement that it was "deeply concerned" by news reports that Saudi Arabia was planning to buy Pakistani-made shoulder-launched surface-to-air missiles and anti-tank systems for armed Syrian rebels based in Jordan.
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It said that the aim was to alter the balance of power in a planned spring offensive by rebels on the regime of President Bashar al-Assad.
"If this sensitive weapon falls into the hands of extremists and terrorists who have flooded Syria, there is a great probability that in the end it will be used far from the borders of this Middle Eastern country," the foreign ministry said.
Long-existing tensions between Russia and Saudi Arabia have intensified further as a result of the Syria conflict, with Moscow standing by Assad but Riyadh offering open support for the rebels.
Russia is widely seen as Assad's last remaining major ally in a conflict that has left an estimated 140,000 people dead since it began as a peaceful uprising in March 2011.