Guardian: Last December, Ukraine's now-deposed, pro-Moscow president Viktor Yanukovych abandoned a trade deal with the European Union in favour of closer ties with Russia. One of the sweeteners in the $20bn support package that helped persuade him was a steep discount around 30% on the price that Russia's gas giant, Gazprom, was then charging Ukraine for the natural gas on which it relies. This weekend, as relations between the two countries descended to an alarming new low, Moscow warned that the cut-price...