Don't worry, it's just a cumulonimbus / Не волнуйтесь, это только кучево-дождевые облака

These clouds can grow up to 15km (10 miles) high, and usually cause localised heavy rain and thunder.

Seen near Enschede, The Netherlands, looking north, a few summers ago. Photo by me. No bombs or conspiracies were used in the creation of this photo.