Definition: In this task, a passage will be given and the goal is to identify an event from the passage. An event is defined as a single word representing something that happened, is happening, or may happen. An event can be factual or hypothetical, positive or negative, certain or uncertain. While most events are based on verbs, an event can also be based on a noun (ex. storm, snow, rainfall) or a copula verb (is, was, been, etc.). The event must not be a pronoun or an adjective. For noun events with multiple words, use the last word in the phrase as event.
Input: Passage: Russia and Ukraine share similar cultures and languages, and Ukraine was ruled from Moscow for centuries. But while the two Slavic neighbors see themselves as natural partners, their relations since the breakup of the Soviet Union have been bedeviled by a number of disputes _ Black Sea naval bases, border problems and Ukraine's natural gas debts.

disputes