The Permanent Representation of Poland to the EU informed on social media that of the 575 tanks delivered to Ukraine by its Western allies so far, 325 were donated by Poland.
In addition, of the twenty-eight aircraft delivered to Kyiv so far, Poland has delivered half, sending 14 MiG-29 fighters.
According to Wikipedia (2023), Poland has 647 tanks. In 2017 Poland had 1,000 tanks.
