With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Russia has never been part of a Union of nations.
text_B: The Margherita Hut -LRB- Italian  : Capanna Regina Margherita -RRB- is a mountain hut belonging to the Italian Alpine Club , located on the Signalkuppe of Monte Rosa in the Alps .. Italian. Italian language. mountain hut. mountain hut. Italian Alpine Club. Italian Alpine Club. Signalkuppe. Signalkuppe. Monte Rosa. Monte Rosa. Alps. Alps
not_related.