I love your visuals, but a brief explanation on them would be helpful, especially when written in Russian. For example, is the figure 237 kilometers the distance between the 2 dots and the straight line? If so that would indicate something different than previously known shelling distance is involved. I just heard BBC World News and they say the Russians are not blaming Ukraine, suggesting an accidental explosion.
The last hit came from the Odessa Oblast. Likely this hit did also - shorter distance.