Second Russian War (20 March 1939-30 January 1941) - was a military conflict (by some historians considered phase of the greater conflict together with First Russian War) between different nationalities of the Russian Empire and Poland and Ukraine, which declared independence from Russia less than ten years before. The conflict had such a profound impact on 20th century history, that "Russianisation" entered dictionaries, meaning rapid disintegration of an empire into smaller states, hostile to each other.