Russia warned the West on Friday that billing in roubles for billions of dollars of natural gas exports to Europe could be just days away, Moscow's toughest response yet to crippling sanctions imposed by the West for the invasion of Ukraine.
With the Russian economy facing its gravest crisis since the years that followed the break-up of the Soviet Union, President Vladimir Putin on Wednesday hit back at the West, ordering that Russian gas exports should be paid for in roubles.
