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: China and the Philippine are among six countries which claim all or part of the Spratlys, which are believed to sit atop oil deposits and command strategic shipping lanes. Acedera said a military reconaissance plane monitored the three Chinese frigates "in the immediate vicinity" of Kota and Panata islands, which are among eight islands occupied by Filipino troops in the South China Sea chain.

among