Moscow attack: attackers received “large sums of money from Ukraine”, say Russian investigators. The White House: Russian leaders are “dung merchants” trying to spread a “absurd propaganda” about the Moscow attack, for which the Islamic State group is “solely responsible” The four attackers, from Tajikistan, a former Soviet republic in Central Asia, were arrested in Russia's Bryansk region while trying to flee to Ukraine, where a "window" allowed them to crossing the border.