By David Gauthier-Villars (Reuters) – A European Union decision to extend sanctions against Russian billionaire Andrey Melnichenko to his wife is “irrational” because she has never held Russian citizenship or resided in Russia, a representative for the couple said on Saturday. Aleksandra Melnichenko, who was born in Belgrade and holds Serbian and Croatian citizenship, will “vigorously contest the unfortunate decision against her”, the representative said in an email statement to Reuters, declining to give a name. Reuters reported last month that Melnichenko ceded ownership of coal company SUEK…