Russia unveils timeline for building its new space station, starting in 2027

Interesting that they are going for a polar orbit. Of course as the article says "The route is particularly useful for observing the entire surface of the planet, according to Roscosmos, and also provides a valuable view over "the strategically important Northern Sea Route". All previous space stations from Russia, China and the US (Skylab and ISS) have been in non-polar orbits, the inclination of the ISS is 51.6°.

One factor about polar orbits is that the crew will receive a higher radiation dose as the Earth's magnetic field diverts charged particles from the solar wind etc towards the poles.