It has been reported the fortifications are part of a project that is the largest operation to strengthen Poland's frontier since 1945.

Poland has started building defensive lines on the border with Russia as part of the "East Shield" initiative, Polish Prime Minister Donald Tusk said on Nov. 1. Presented this May, the "East Shield" program aims to fortify Poland's eastern borders with Belarus,

The project, known as the "Eastern Shield," involves the construction of fortification structures and infrastructure to meet defense needs. Read also: Poland continues building fortifications on Belarus border "Construction of the Eastern Shield has begun!

Poland has begun construction of a 400-kilometer line of defensive fortifications along its borders with Russia and Belarus.