This is how Slavs today handle illegal alien Muslim invaders when they wash up on the shore.
The historic tyranny and conquest by the Ottoman Turkish Empire of Slavic nations is not lost on these men. Islam separated the world and its inhabitants into two zones: the world of Islam and the world of non-Muslim heretics. Distinctions of ethnic nationality were not important. The lives of the mass of population under the Ottoman Turkish system were tightly controlled. When recruits for the military were needed, Christian boys were confiscated from the population as slaves and forcibly converted to Islam.