Task: Question Generation
Input (English): Passage: During the war, the Russian army organized the Crimean campaigns of 1687 and 1689, which both ended in Russian defeats. Despite these setbacks, Russia launched the Azov campaigns in 1695 and 1696, and after raising the siege in 1695 successfully occupied Azov in 1696.
Output (English): How many years apart were the Crimean campaigns?