WI: Mehmed II fails?

What if Constantinople was able to withstand the 1453 siege? How long would the Byzantines survive? Could they get Russian help since Ivan III married Constantine's niece? Could the Byzantines (with possible Russian aid) survive the Ottoman invasions?
 

raharris1973

Gone Fishin'
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Russia cannot get any aid to Constantinople without permission of the Golden Horde or Crimean Khanate? And is a spiritual communion really enough to motivate Russians to make the effort of organizing a Crusade and paying tolls to transport stuff across?
 
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