The two-tier system is designed to allow more predictability amid relentless Russian airstrikes.

Kyiv and the Kyiv region are preparing a differentiated air raid alert system, fewer train stops, and round-the-clock operation of railway stations. — Ukrinform.

Kyiv and the surrounding region remain key targets of the strikes, with eight air raid alerts sounding by 1:30 p.m. on Aug. 31.