As far as I know there is no such thing as winter time.
Russia had standard time (UTC+3) in winter and changed to daylight savings time (UTC+4) at same dates as the rest of Europe. Now they decided never to switch back to UTC+3 but stay UTC+4, effectively making UTC+4 Moscow standard time.
As Moscows longitude is 37 degree East, they should really use UTC+3 as their standard time, but that's a different story.
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Winter time is the standard time (i.e. based on solar noon).
It's summer time that is moved.
Maybe that's only in the US and Russia has the reverse?
As far as I know there is no such thing as winter time. Russia had standard time (UTC+3) in winter and changed to daylight savings time (UTC+4) at same dates as the rest of Europe. Now they decided never to switch back to UTC+3 but stay UTC+4, effectively making UTC+4 Moscow standard time.
As Moscows longitude is 37 degree East, they should really use UTC+3 as their standard time, but that's a different story.