The headquarters of the Russian Black Sea Fleet in Sevastopol on the Crimean peninsula was attacked by drones on the 20th, but no casualties were caused.
Later on the 20th, Sevastopol Mayor Razvozaev posted on social media that the air defense system in Sevastopol was activated again that evening.
Local citizens posted a video of local anti-aircraft weapons firing through social media.
But it's not clear what they're hitting.
In addition, local officials in Crimea said that in the evening of the 20th, the local air defense system was activated near a resort on the west coast of the Crimea peninsula, and two anti-aircraft missiles were launched into the air.
According to Ukrainian media reports, explosions were heard in many parts of Crimea on the 20th.
(Headquarters reporter Wang Bin and Song Yao)