The German daily Die Welt published an in-depth analysis focused on the rising influence of Bulgarian oligarch and politician Delyan Peevski , just as Bulgaria prepares to join the eurozone. Written by international editor Philip Volkmann-Schluck, the article , titled “Revealing Europe’s Failure - How an Oligarch Expands His Power in a Eurozone-Joining Country,” examines the country’s ongoing struggle with corruption and political instability. Kiril Petkov , Bulgaria ’s former prime minister