You are not thinking this through. If Putin stated he was going to give Russian long range missiles to xyz group/country for xyz group/country to shoot into Germany, do you think Germany would blame Putin 100% or not at all?
Id say it matters not a jot if the German missiles are fired deep into Russia from German soil, a warship, Ukrain territory. Totally irrelevant. It is an unprovoked attack by Germany on Russia, and is a VERY dangerous move.