With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Iran has yet to have any conflicts with the Russian Empire.
text_B: The Caudron C. 25 was a large , three engined , biplane airliner , designed and built in France soon after the end of World War I. Its enclosed cabin could accommodate up to eighteen passengers .. biplane. biplane. airliner. airliner. France. France. World War I. World War I
not_related.