Wholesale gas prices, as reported by the utility Vayu, are 39 per cent down since the beginning of the year and 38 per cent lower than at the same point last year. Photograph: Kristian Helgesen/Bloomberg

Tensions with Russia over Ukraine unrest could lead to future supply problems

President Barack Obama and owner Mark Cuban participating in an event  at the White House. Photograph: Mark Wilson/Getty Images

Billionaire with links to Obama comes out against firms that shift HQs overseas

Photograph: Aidan Crawley

Action follows an alleged dispute with other senior executives at the airline

Deutsche Bank has agreed to buy a portfolio of €400 million worth of property loans linked to the developer Gerry Conlan from Nama

Project includes loans secured on several prominent buildings in Dublin city

Between 2009 and 2012, Tullow had drilling successes in Africa, opening up new basins in Uganda (above), Ghana and Kenya

Will the wildcatter’s run of drilling disappointments weaken its balance sheet in the future?

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