https://en.wikipedia.org/wiki/Polikarpov_I-3

https://en.wikipedia.org/wiki/Polikarpov_I-5

https://en.wikipedia.org/wiki/Polikarpov_I-16

The Polikarpov I-16 was a Soviet fighter aircraft of revolutionary design; it was the world’s first low-wing cantilever monoplane fighter with retractable landing gear to attain operational status and as such « introduced a new vogue in fighter design. »^[1] The I-16 was introduced in the mid-1930s and formed the backbone of the Soviet Air Force at the beginning of World War II. The diminutive fighter, nicknamed « Ishak » or « Ishachok » (« Donkey » or « Burro ») by Soviet pilots, figured prominently in the Second Sino-Japanese War,^[2] the Battle of Khalkhin Gol^[2] and the Spanish Civil War^[3][4] – where it was called the Rata (« Rat« ) by the Nationalists or Mosca (« Fly« ) by the Republicans. The Finnish nickname was Siipiorava (« Flying Squirrel« ).

Le Polykarpov Design Bureau: https://en.wikipedia.org/wiki/Polikarpov