In this task, a passage will be given and the goal is to generate a question about temporal relations based on that passage. A temporal relation describes the relation between two things with respect to time e.g., something happens/starts/terminates/... immediately/shortly/usually/... before/after/during/... something else.
Your question should include an event, or ask about an event, and should not be a yes/no question.
Q: 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.
A:
What event has already finished?