On Monday, Kiev's delay in paying for gas supplied by Russia led to Moscow cutting supplies to Ukraine. The leaders of the two countries have held talks in an effort to end the disput and Russia has reached agreement with both the Ukrainian President and the Prime Minister. This is why today, when the tension is high again, analysts say the cause of the new row is a power struggle at the heart of Ukraine's government. What do Ukrainian politicians have to say about it all? We are about to find out from one of the top Ukrainian politicians, former Foreign Minister, Boris Tarasuk.