Playing the devil's advocate here, but the USA has "always" had
nuclear weapons on German soil. It was to be a front line state in case the Cold War got hot and while this is no longer the case, the bombs were never removed. What has happened is that the US's new toys, the W61-12, got delivered for service in Germany. On the grand scale of things, gravity bombs with only a maximum yield of 50kt are not something that should cause distress to any of the nuclear parties.
Of course, with the current rhetoric being what it is, anything can be taken as provocation (like Russia moving Iskanders and Backfires to Crimea).