The Tsarist Government's decision undoubtedly added a bucket of oil to already sparking France, making the situation increasingly uncontrollable.
Fortunately, after the victory in the Anti-French War, the Allied Forces had confiscated the weapons of the French, otherwise, it would not just be an attack on isolated Russian soldiers.
Seeing the conflict escalating, King Carlos, situated at the eye of the storm, decisively fled Paris, the powder keg, under the pretext of seeking international aid.
With the King forced to flee and hide from the turmoil, the already striking French Government naturally followed suit and shut down.
A similar scene had happened after World War I in the original timeline. Only, the Germans had a more solid foundation, the war had not been fought on their territory, and their losses were not as great as those of the French.