3 smaller star-like objects moving around a brighter one making rapid speed changes and directions.

I’m a airline B787 pilot. We were flying at 38,000 ft at approx 1015Z over the Pacific about 1000 miles north of Hawaii. The other pilot and I witnessed on several separate instances, 3 or 4 distant and very high altitude lights that looked like stars in the night sky. They would appear out of the darkness in the same spot of the sky, become increasingly bright, and would circle around each other. 2 of them appeared dimmer and smaller than the third, which appeared much brighter. They would accelerate and change directions rapidly at seemingly incredible speeds, then they would fly apart, the brighter one would stop momentarily, and the they would disappear until doing the same thing again a few minutes later. We saw this happen several times. I captured the last “event” on my Ipad video. Approximately 15 minutes after all of this occurred, I noticed what I thought was Venus (which I thought to myself I didn’t see it before as it was blocked by my cockpit window post). As I looked at what I thought was Venus, it appeared to be moving very slowly. Over a matter of seconds it then moved away from us to the south and ultimately dimmed as it moved away and disappeared towards the horizon. Initially when I first saw it, it appeared to be just a stationary planet until it began its movement. This was not the typical motion of a orbital satellite. I’ve subsequently expanded numerous frames of my video, and with a magnifying glass could clearly see a greenish luminescent glow from the trailing edge of the triangular shape of the brightest object. In my video the brightest object made a sudden acceleration straight downward (or away from us), it stopped, then disappeared.