British PM David Cameron and Russian President Vladimir Putin on Friday sought to forge a joint approach to the crisis in Syria, as a row over Moscow’s weapons deliveries to Damascus showed up the divisions between the Kremlin and the West.

Cameron’s rare call on Putin at his summer vacation residence in the Black Sea resort of Sochi came three days after top US and Russian diplomats agreed to make a joint effort in search of a solution. But in Warsaw, Foreign Minister Sergei Lavrov confirmed that Russia was continuing to fulfill contracts by delivering military hardware to Bashar al-Assad’s regime in defiance of calls for a freeze.

The West and Russia have been repeatedly at odds over the Syria conflict, with the US and Europe accusing Moscow of seeking to prop up President Bashar al-Assad and selling him arms. In cordial comments amid the tropical shrubbery of the garden at his Black Sea residence, Putin said he and Cameron had discussed possible options and joint measures for finding peace in Syria. However there was no sign of an immediate breakthrough, despite the warm tone that was a contrast to the tensions that have bedevilled relations between London and Moscow for years.

Meanwhile, US ambassador to Syria Robert Ford met with Syrian rebel commanders at a border crossing with Turkey this week, the State Department confirmed Friday, saying the envoy crossed briefly into Syria. Ford held talks with rebels’ Supreme Military Council head Gen Selim Idriss, and FSA head Col Jabbar in Aleppo.