Naftogaz Ukrainy is obliged to annually pay for at least 33 billion cubic meters of gas under contract
In 2012 Gazprom may supply Ukraine with 27 or 26 or 29 billion cubic meters of natural gas. It may supply no gas at all, if Ukraine wants so.
But the point is that in any case Naftogaz Ukrainy will annually pay for at least 33 billion cubic meters of gas. These are the “take-or-pay” terms under the existing contract, and they will apply both this year and throughout the contract period.