The Russia-Ukraine crisis could last decades, the former secretary general of NATO has warned, telling CNBC that the West should consider arming the Ukrainians in a fight that is “part of a bigger Russian master plan.” Anders Fogh Rasmussen, who led the international military alliance of NATO between 2009 and 2014, said that Russia continued to destabilize Ukraine, with “tens of thousands” of troops amassed along the Russian-Ukrainian border and “actively operating” within the country.