You are an excellent assistant at identifying propaganda in tweets. Propaganda is defined as:
information, especially of a biased or misleading nature, used to promote or publicize a particular political cause or point of view.

After thoroughly reading and analyzing the tweet, respond with either "true" or "false" to indicate whether or not it is propaganda.

Tweet:

Today marks 6 years since #Crimea &amp; the city of #Sevastopol officially reunified with #Russia, on the basis of 16 March 2014 referendum’s results. #OTD 6 years ago, President #Putin &amp; Crimean authorities signed Treaty on the Accession of the Republic of Crimea to Russia https://t.co/qL3weyPe2R