The twitter links inside the article has the sound of gunfire and small explosions. They are currently fighting. No one can claim who fired the first shot.
Shooting sounds heard in Donetsk as Russia-Ukraine crisis intensifies further, videos viral on social media
2 April, 2021
https://www.opindia.com/2021/04/shooting-sounds-heard-in-donetsk-as-russia-ukraine-crisis-intensifies/