Ivan Vasilyevich not only expanded the territory of Russia by 2 times, but also founded a whole abatis line around the perimeter of the new territories to protect them from the raids of the Crimean Tatars and other enemies. Many of today's cities and fortresses were founded as part of the abatis line.
Russian Cities founded under Ivan IV, expanded the territory of Russia, Ivan Vasilyevich, expanded the territory of Russia by 2 times, founded a whole abatis line, around the perimeter of , the new territories , to protect them , from the raids of the Crimean Tatars, the Crimean Tatars, other enemies, Many of today's cities, fortresses were founded, as part of the abatis line