Robert (Madyar) Brovdi, Commander of the Unmanned Systems Forces, warned of a possible continuation of Russian attacks. He described the confrontation with Russia as a "crucial test of endurance" and urged Ukrainians to keep their nerves of steel and remain vigilant.

Former Defense Minister Oleksii Reznikov stated that military service in Ukraine should apply to all citizens—both men and women.

On the night of 21 August, Russian drones attacked the Bolhrad and Izmail districts.

Russian troops carried out 238 assaults over the past 24 hours, with the highest number occurring in the Pokrovsk, Kostiantynivka, and Huliaipole sectors.

Russia launched a massive attack on Ukraine's southern regions. One person was killed and 23 were wounded in the Kherson region, while four people were injured in the Zaporizhzhia region.

On the night of August 21, Russian invaders launched 135 drones of various types at Ukraine.

Russia attacked Konotop in the evening and launched a massive strike on Sumy during the night. Four locations in the regional capital were hit, and at least two people were injured.

Since the start of Russia’s full-scale invasion, the Ukrainian Defense Forces have wounded and killed 1,474,030 Russian occupiers.

On the morning of 21 August, explosions were heard in Perm, as Russian air defences repelled a drone attack.

Oleksii Reznikov, Ukraine’s former defence minister, has stated that he has no regrets about the authorities’ public rhetoric in the run-up to Russia’s full-scale invasion. According to him, the statements made to the public differed from Ukraine’s actual preparations for a possible attack.