So you are saying that if Russia used a tactical nuke against...

So you are saying that if Russia used a tactical nuke against Ukraine then France should retaliate. That would lead to a major escalation and then probably something akin to nuclear Armageddon.
Nobody wins and everybody loses. Everybody.
it is easy to be bullish like yourself when you don't look at the consequences.
In this particular case, Macron is being smart. Not cowardly.