Object was spotted high, nw over the foothills. it flashed and pulsed different colors but was really distant, i couldn't make out a pattern. had a second opinion to make sure it wasn't a star or plane and the person also saw the colors flashing. 20 minutes later a plane started flying that direction. the plane lights were not as visible when they reached where the object was. the objects lights were far brighter than the plane. the object responded to the planes approach by flickering dimly and then going out entirely. when the plane had passed and was gone for a few minutes, seemingly close but higher than the object, the lights started strobing again. unsure if this was a ufo but interesting that it responded to the plane. could have been a drone or even a helicopter, it was too far to tell size or shape. only saw the flashing lights. i have a video if needed, but i can't see anything on it. the phone camera doesn't pick up the object, however if there is software to help this, it maybe visible. i have no clue how to upload this.