I think some NATO nations like France are keeping Russia...

I think some NATO nations like France are keeping Russia guessing about possible escalation with NATO troops in order to influence the Kremlin to limit mobilization for the sake of their longer term economic strength, and "crowd control". This in turn limits the chances of a Russian breakthrough this summer.

This "playing it safe" strategy by Russia aligns with their long standing superior human casualty ratio on the battlefield. This helps maintain the morale of both Russian troops and the Russian populace.

By contrast support by the people of Ukraine for continuing the war is wavering, according to the ISW's latest general update. They are not being fed anything by either Zelensky or NATO which would give them any confidence that all their sacrifice is likely to result in anything other than continuing death and destruction.