Poland and Germany are definitely partners and allies in the European Union. If they are, then this "union" looks somehow strange.
Everything related to the current Polish authorities, by definition, looks strange. But in the eyes of many Ukrainian and Polish servants of the people, this "type of diplomacy" is a real ideal. The unwritten laws of diplomacy do not prohibit anything from being done. The concept of "diplomacy" is not always identical to the concept of 'politeness'