At the western edge of the Eurasian steppe, caught between Central Europe, Russia, and the Middle East, Ukraine has long been the meeting place of empires - Roman to Ottoman, Habsburg to Russian - that left their imprint on the landscape, the language and the people. The frontier between Islam and Christianity created a class of ferocious warriors known as the Cossacks, while the encounter between the Catholic and Orthodox churches led to a religious tradition that bridges Western and Eastern Christianity.