If Russia launched a missile at a Western nation, but it turned out the missile was a dud, so when it hits it does almost no damage, would anyone have the sligh

If Russia launched a missile at a Western nation, but it turned out the missile was a dud, so when it hits it does almost no damage, would anyone have the slightest doubt that this was an act of war? It doesn’t matter if the missile does damage, the mere effort of launching is an act of war. Likewise, it does not matter if a Russian intelligence operation is successful.