Saw slow moving red light with a bright white center which traveled from the northeast to southwest then disappeared suddenly

While walking from my house to my Garage, saw a bright red (almost glowing) light over the tree line to the northeast. In the center of the light was an even brighter white light which almost had an amber tint, like incandescent light. The light appeared unusually low and moving very slowly, almost as if floating. At first I thought it might be a low flying helicopter but it made no sound and there were no flashing lights or spotlight beam. As it slowly moved over my property, it seemed to be gaining altitude rapidly, but not moving rapidly. I grabbed some binoculars and watched it for 30-45 seconds through the binoculars. There was no shape that I could see, just the light, which was now moving to the southwest and seemed to be much higher than when I first saw it. Then it suddenly disappeared, as if you had just shut the light off. The total elapsed time from first sighting was 2-3 minutes.
The sky was clear, moon was bright, and some stars visible. This is a rural area with very little light pollution. It is also located under the flight path for both SeaTac airport and the Joint Base Lewis-McChord base, which is about 25 miles SW of my location. I see commercial flights daily, and regularly see military craft including low flying single and double rotor helicopters (which are extremely loud) and occasionally large multi engine military transport planes. This was unlike anything I have ever seen before.