I don't think Russia will use a battlefield nuclear weapon, they'll threaten and shout about it but I don't think they will.
The risk of dragging NATO in is far too high; if they use such a weapon - and the fallout blows into Poland or Sweden, or other unintended consequences occur, it could totally provoke a NATO response.
The other problem is the use of such a weapon by Russia I think would terrify the Russian population, an escalation like that and the knock-on effects - could trigger absolute anarchy in Russia.
The risk of dragging NATO in is far too high; if they use such a weapon - and the fallout blows into Poland or Sweden, or other unintended consequences occur, it could totally provoke a NATO response.
The other problem is the use of such a weapon by Russia I think would terrify the Russian population, an escalation like that and the knock-on effects - could trigger absolute anarchy in Russia.