Could Greek and Russian churches share Constantinople?

Would the division between the Greek and Russian Orthodox churches make joint control of Constantinople unworkable?

Not immediately; victory could sustain wartime cooperation, but ecclesiastical and political rivalry would probably return afterward.

The proposed Greek-administered Russian protectorate would contain a built-in dispute over Orthodox authority. The immediate prestige of recovering Constantinople and Hagia Sophia could keep both sides cooperating during the war. Nicholas II might convene a grand church council in the city, drawing representatives from other Christian churches while also removing himself from direct military management. The arrangement is therefore a temporary coalition mechanism whose religious and political contradictions would resurface after the common war ended.