What a week it's been for Russia's ruble - the currency that was in crisis in December has hit new highs against the dollar and euro to become this year's best performer in foreign exchange markets.
2015 Economic Crisis
CNB News: Russia’s ruble – from down-and-out to darling
People prepare a sled in the form of the Russian ruble during the Winter Sledge festival in St. Petersburg, on Feb. 1, 2015.
