Think Defence on Twitter: "Concrete Lego blocks. All along the border with Russia, NATO nations should have half a dozen pallets of these pre-positioned at every road junction, bridge and railway line
Lego Blocks - Fairbanks Materials Inc. (FMI)
Cement Building Block Toys : Concrete Legos
Metal frame tensile structure - LEGO BLOCK - Toro Shelters - roof / with PVC membrane
Lego Block - Kildea Concrete
These Lego-like blocks let you build your own concrete walls - Block Moulds