Finland has begun construction on a barrier fence along the border it shares with Russia, the country announced. Construction will begin on a pilot phase that’s 3 kilometers, or 1.8 miles, in length in order to test the barrier’s capabilities before completing the entire project.

The full barrier is expected to take three to four years to build, depending on funding and the smoothness of the construction process, the country said.

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The border between Russia and Finland is 1,300 kilometers, or over 800 miles, long. The barrier being built will be about 130 to 260 kilometers, or 80 to 160 miles, long when completed.

Read more: ABC