From DW.com:
Poland started to construct a defensive barrier along its border with Russia and Belarus in 2024. The East Shield defense system will eventually be around 800 kilometers long, and is intended to protect this country on NATO’s eastern flank against attack from the east.
When the Polish prime minister, Donald Tusk, inspected the first completed section in November 2024, he declared that the project was meant to “deter and discourage a potential aggressor” and was “truly an investment in peace.” The Russian invasion of Ukraine in February 2022 was a profound shock to Poland’s sense of security. The Tusk government has increased defense spending in 2026 to 200 billion zlotys (around 46 billion euros, or 54 billion dollars) ― almost 5% of Poland’s GDP