Seems like a bunch of concentric circles with lines going away from the center.
I have never been to Moscow, but it seems like an interesting success story of planning infrastructure projects properly.
https://en.wikipedia.org/wiki/Moscow_Metro#/media/File:Mosco...
In Paris it takes you 3-5 minutes to walk between mostly any of the stations of one line. Coming to Moscow I was somewhat surprised to find that the stations can be 30-45 minutes walking distance apart.
That all makes sense of course, given the population density structure of the cities and the mix of inner-city and suburban trains. But it's kind of hard to take that from these kinds of plans if you don't already know the city, and every station is evenly spaced apart on paper.