Elements of sighting

1. With my dog out, saw 2 fighters very low, very loud.

2. In the next moment there it was rotating slowly up and down to the west above trees some 20 metres.

3. Dove into trees! for about 5 seconds (I went to this place, but found nothing)

4. Climbed vertically, & slightly toward me (4 km away from it)

5. Disappeared instantly !

Before I saw it, 2 fighter jets were making very loud thunder, flying very close above tree line. My phone has 2 megapixel camera, so it's very poor resolution, but the object is visible in it. If it was a glider or something, it would not go higher in vertical line and in one moment disappear. The path of it was not straight, glowing only one side of it, rotating around vertical axis every 2-3 seconds, back side dark gray.

You know, when something isn't right, you notice. I felt the feeling in my stomach when I noticed it was not a glider, I began to shake a little, then it rose and was gone.