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Why did Pope John XII ask Otto I to come to Italy?

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Map of Europe about 800 CE showing the extent of the Frankish kingdom under Charlemagne in light purple, covering much of present-day France, Germany, northern Italy, and neighboring regions. Areas inhabited by Slavic peoples who were tributary to Charlemagne are shaded in a darker purple to the east of the Frankish kingdom, including groups such as the Bohemians, Moravians, and Croats. Major cities, rivers, and neighboring kingdoms are labeled for context.
Holy Roman Empire

Pope John XII summoned the German king Otto I to Italy in 961 because the papacy was under severe military pressure from Berengar II, the king of Italy, who was on the verge of seizing control in Rome.123

The pope sought Ottoā€™s protection to secure his own position and the authority of the church against these threats. Otto, who had previously intervened in Italian affairs in 951, responded to the appeal and marched into Italy. Upon arriving in Rome in February 962, Otto was crowned Holy Roman emperor by John XII, formalizing a relationship where the emperor acted as the protector of the Roman church.1425

This alliance was short-lived, however; the pope soon feared that Otto intended to exert imperial supremacy over the papacy, leading to political conflict and Ottoā€™s eventual deposition of John XII.45