Soldiers build razor wire fence on Poland's border with Russia's Kaliningrad near Bolcie, Poland November 3, 2022. (Photo: Arkadiusz Stankiewicz/Agencja Wyborcza.pl via REUTERS /File Photo)

Poland's border with Belarus has been a flashpoint since migrants started flocking there in 2021, after Minsk opened travel agencies in the Middle East offering a new unofficial route into Europe.

Since Russia's 2022 military operation in Ukraine, relations have become even tenser, with Warsaw ramping up defence spending and accusing Minsk and Moscow of attempts to destabilize Poland.

"We are starting a major project to build a secure border, including a system of fortifications as well as landscaping and environmental decisions that will make this border impossible to pass for a potential enemy,” Prime Minister Donald Tusk told a news conference.

Tusk did not give further details of what kinds of fortifications would be built.