Observed an object alternating Red and Green light

I was standing on a roof top deck looking east towards the Atlantic Ocean. The house was 3 blocks from the water. I observed an unknown object moving from near ground level to high in the sky. There is a separate object with what appears to be a white blinking light near this one in the clouds at the highest point i witnessed. The object moved slowly at first, accelerating to a high speed moving over houses then back towards the ocean. Directions changed as did apparent height. Speed went from a standstill to rapid movement then stationary. The object had red alternating green light. Red appeared to be circular and 2 thin green posts. The video was made on a Galaxy S20 Note. The quality is not great.