Russia's finance ministry, which is set to resume daily foreign currency purchases on the market on Jan 15, is seen buying 280 billion roubles ($4.2 billion) worth of currencies by Feb 6, a Reuters survey showed on Thursday. The finance ministry is returning to the open market with daily buying of foreign currency for its reserves for the first time since August, when the central bank decided to put these buys on hold to ease pressure on the rouble.