The Russia–Ukraine border is the international state border between the Russian Federation and Ukraine. Over land, the border outlines five oblasts (regions) of Ukraine and five oblasts of the Russian Federation. The modern border issue has been ongoing ever since the fall of the Russian Empire in 1917. In 2014, the Ukrainian government unveiled a plan to build a defensive walled system along the border with Russia, named "Project Wall". It would cost almost $520 million, take four years to complete, and has been under construction as of 2015.