The user provided an image containing a map and text related to the history of Rus'. The user did not ask a specific question, but the presence of the instruction "5. Обведи на «ленте времени» год крещения Руси" suggests a task related to identifying a historical year on a timeline. The image also contains a timeline with numbers like 987, 988, 989, 990, 991, 992, 993, 994, 995, 996. The task is to identify the year of the Christianization of Rus' and indicate it. Based on historical knowledge, the Christianization of Rus' occurred in 988 AD under Prince Vladimir. Therefore, the number 988 on the timeline corresponds to this event. The goal is to output a JSON with the identified year.