Tower with ramp or external staircase

[Anton]

Medieval entry towers didn't usually have ramps or ladders but often the walls behind them had buttresses, like this one from 1397 St. Cyril-Belozersky monastery (St. Cyril was of Russian orthodox background). Note the flag finial, which is usually associated with parts farther west (the monastery also has onion domes):

That's not a good example. The monastery was originally wooden, the first stone constructions are dated to late XV century. The tower depicted dates to circa 1591, and I guess so do the walls, although they have been renovated from time to time, so I don't know the dating of the buttresses. The present roof of the tower dates to 1835