 Complete the following phrase:  Construction of Koltsovos original aerodrome was between 1928-1930 by demand of the Air Force Institute of the USSR. It was primarily built as a military aerodrome. In 1932, the 33rd air division, priorly belonging to the Privolzhsky Military District, was transferred to the Koltsovo aerodrome; the division was later redirected to the border with Finland during the Winter War. One day after Nazi Germany declared war on the USSR, 