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The other thing is, there is activity to the north of Ukraine, in Belarus: Russian forces have been moving into Gomel, presumably with a view to heading for the border with Ukraine.
Also, Belarusian troops have been on the move too, although most people think Lukashenka will not risk sending his boys in as it might spark a rebellion. Many Belarusians already fight with Ukraine.
The term "Russian forces" is perhaps slightly misleading: it's apparently new recruits. While it may be useful as some sort of diversionary tactic, the prospect of this lot succeeding where the original Russian army failed would appear to be less than zero.