Opinion - In our era of oligarchs and gangsters, murdered journalists and outgunned tax inspectors, Putin and Trump, how do you write a critical book about money and power in the world that doesn't feel utterly futile? It's a question Oliver Bullough often asks himself. In this volume he lists some of the enterprises that operated in Ukraine during the infamous presidency of Viktor Yanukovych from 2010 to 2014: "his coal mining companies ... which were [for legal purposes] owned in the Caribbean"; a "medicine racket