It was a brightest object in the sky.
This already makes one think "Venus?"
At about 6 PM on 25-Jan-2019 from Riga Latvia the planet Venus was about 17 degrees above the horizon in the Southwest.
Venus is always strikingly bright when it's visible, it's apparent magnitude stays between about -3.8 and -4.8.
From in-the-sky.org's planetarium mode
This matches nicely to your photo out the window:
But what about the donut-shaped image?
Your image is way, way out of focus. The the outside of the annulus represents the diameter of the telescope's primary and the inside represents the diameter of the blockage by the secondary mirror holder. The blockage is about 45% of the radius or about 20% of the area, which seems reasonable for some telescopes. Here's a random example of a telescope with a similar blockage.
Here are some other celestial donuts to enjoy! In this case they are caused by a tiny spot of dust which is out of focus, and one is dark rather than bright, but they are other examples of how point-like objects that are out of focus show you your aperture.
above: from this answer, below: from this answer