Taiwan says six Chinese balloons either flew over the island or through airspace just north of it, while Chinese warplanes and navy ships were also detected in the area. The dispatch of such balloons, which generally disappear into the Pacific to the east, appears to be on the rise, though their purpose has not been publicly announced. The Defense Ministry noted the balloon sightings on a list released Monday of Chinese People's Liberation Army activity in the waters and airspace around Taiwan. It remains unclear whether the balloons have an explicit military function, but they appear to be part of a campaign of harassment against the self-governed island that is claimed by China.