Protected from sea power by ice to the north and mountains and deserts to the south, the island's vast land area was threatened only by land invasion on its western border from Western Europe to Russia.
The island's vast land area was protected from sea power by ice to the north to the south. The island's vast land area was protected from sea power by ice to mountains and deserts to the south. The island's vast land area was threatened only by land invasion on its western border from Western Europe to Russia.