I understand that the Russian Grand Princes of the 11th and 12th century had connections with the Byzantine Greeks, and that they interacted with Eastern European Catholics. I'm just curious as to the opinions of Russian Princes towards the crusades. Did they agree with the idea of a "Holy War" that the crusaders followed, or did they see it as a foolish venture?
As a follow-up, how Christianized was late 11th century Russia? Was Orthodox Christianity the religion of the majority of people west of the Urals?