Keeping the barbarians behind the wall around Ukraine

Daily Beast:

Pushed against the wall by Russia’s naked aggression, a wounded nation now wants to seal itself off completely from its jingoistic neighbor. Behind the electoral gambit played out at the polls on Sunday, meant to draw a philosophical and political line against the neo-imperialism of Russian President Vladimir Putin, there’s also a construction project.

Ukraine’s President Petro Poroshenko announced plans in early September to build an extensive wall—called, well, “The Wall”—on the country’s border with Russia that, theoretically at least, would keep Moscow out and secessionists in. The defenses would include an actual steel wall, in addition to watchtowers, trenches for soldiers, and a barbed no-man’s land running contiguous to the countries’ massive shared border. These miles-long fortifications will include 4,000 army dugouts, tank detachments, and sophisticated surveillance equipment to detect troop movements across the frontier.

Although the thousand-mile-long project (1200 miles to be exact) seems improbable in scope and almost as Quixotic as the Maginot Line, the government already has earmarked funds for the project, and work has begun on the border near the northern city of Kharkiv, away from the conflict zone.
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There is much more.

Walls have been effective at stopping infiltration in Israel.  They will inconvenience  invading forces channelling the invasion into areas where they can be attacked.  They can buy time for the defenders to get in place.