In November 2011, Poland joined the NATO Cyber Defence Centre of Excellence located in Tallinn. Poland’s contribution to the policing of Baltic airspace has been noteworthy. From February to April 2020, Polish airmen were stationed for the first time in Ämari. Before that Polish fighter planes have guarded the Baltic airspace as part of the rotating schedule since 2006 from Šiaulia in Lithuania. Poland contributes regularly at Estonia’s annual military exercise Spring Storm. In 2019 Poland participated with 233 troops, 4 SU-22 fighter planes and several navy vessels. In previous years, Polish troops have also participated in the SIIL exercise.