US Secretary of State Rex Tillerson arrived in Moscow today to confront the Russian leadership over its support for President Bashar al-Assad's Syrian regime.
Before setting off for Moscow, Tillerson told a G7 foreign ministers' meeting in Italy that Russia should rethink its alliance in the light of the latest alleged chemical attack in Syria.
"I think it's also worth thinking about Russia has really aligned itself with the Assad regime, the Iranians, and Hezbollah," he said, referring to Syria's other military allies in its six-year-old civil war.
"Is that a long-term alliance that serves Russia's interest, or would Russia prefer to realign with the United States, with other Western countries and Middle East countries who are seeking to resolve the Syrian crisis?"
Tillerson was due to spend the night in Moscow before holding talks tomorrow with his opposite number Foreign Minister Sergei Lavrov.