With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Ilkhanate contained Poland.
text_B: The Decembrist revolt or the Decembrist uprising -LRB- -LSB- Восстание декабристов , Romanization of Russian , transliteration  : Vosstanie dekabristov -RSB- -RRB- took place in Imperial Russia on .. Imperial Russia. Imperial Russia. Russian army officers led about 3,000 soldiers in a protest against Tsar Nicholas I 's assumption of the throne after his elder brother Constantine removed himself from the line of succession .. Tsar Nicholas I. Nicholas I of Russia. Constantine. Grand Duke Constantine Pavlovich of Russia. Because these events occurred in December , the rebels were called the Decembrists -LRB- Dekabristy , Декабристы -RRB- .. Decembrists. Union of Salvation. This uprising , which was suppressed by Nicholas I , took place in Peter 's Square in Saint Petersburg .. Saint Petersburg. Saint Petersburg. In 1925 , to mark the centenary of the event , the square was renamed as Decembrist Square , but in 2008 the name was changed to Senate Square .
not_related.