Russian president, Vladimir Putin, says Moscow will begin insisting that payments for Russian gas - from unfriendly countries, as he put it - are made in roubles. He's given the Russian central bank a week to find a way of switching these payments away from other currencies. Jane Foley is head of FX strategy at Rabobank and explains what the impact will be.

And Susan Schmidt of Aviva Investors in Chicago tells us how markets have been reacting to Putin's announcement.