by Dave CLARK Russian President Vladimir Putin threatened the existence of Ukrainian statehood as his army’s invasion of the neighbour faces stiff resistance Sunday and his economy is increasingly asphyxiated by sanctions. In the latest efforts to freeze Moscow out of the world economy, US-based card payment giants Visa and Mastercard announced they will suspend operations in Russia, while world leaders vowed to act over the intensifying onslaught. “The current (Ukrainian) authorities must understand that […]