Sabotage bedroht Putins Kertsch-Brücke

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2019: Putin im Führerstand des ersten Zuges.

Links (rot) die Bahn, rechts (blau) die Strasse.

Jeden Samstag sendet uns “Forbes” eine Kriegsanalyse von David Hambling. Diesmal greift Hambling die Gefahr auf, die Putins Kertschbrücke von ukrainischen Spezialkräften droht. Putin weihte die Brücke 2019 pompös ein. Damals war sie die einzige Landverbindung von Russland auf die 2014 annektierte Krim.

Seit Ende April besteht auch die terrestrische “Brücke” von der Perekop-Landenge nach Mariupol–Taganrog–Rostow, welche die russische Armee errichtet hat. Dennoch bleibt die Eisenbahn- und Strassenbrücke über die Strasse von Kertsch von politischer, wirtschaftlicher und militärischer Bedeutung. Gelänge den ukrainischen Operators die Sprengung der Brücke, wäre das ein Donnerschlag wie die Versenkung der “Moskwa” durch Seezielraketen; womöglich noch stärker.

Die strategische Bedeutung der Brücke.

Der gesamte Übergang misst 19 km, die kurze Brücke 1,4 km, die ange Brücke 6,1 km.

Es folgt der Originaltext von Hambling.

The Crimean Bridge that spans the Kerch Strait.

The Kerch Strait bridge connecting Russia with the Crimea is extremely important, both strategically and politically. Stretching for more than ten miles, it is the longest bridge in Europe, and was constructed after Russia’s illegal annexation of Crimea and opened in 2018 at a cost of over $3 billion. Putin himself drove a truck acrossto open it. It is a huge and obvious target for Ukrainian special forces, and now seems to be under threat with a new doomsday clock supposedly counting down to the bridge’s destruction.

The bridge carries both road and rail line. When it was opened, one Ukrainian think tank described it as “Russia’s fingers on the throat of Azov,” and the Russians use it to transport tanks and other military hardware directly to the combat area in the south. To the Russian inhabitants of Crimea the bridge is their lifeline, their connection with the home country; some reports suggest that many are already leaving due to the uncertain military situation.

However, cutting a bridge of this size is quite a challenge. The supports are massive concrete and steel constructions, and attacks on similar bridges show they cannot be brought down by anything less than a direct hit with a massive warhead. The USAF’s choice of weapon for bridge-dropping is a series of guided 2,000-pound bombs, and even then success is not guaranteed, as pilots discovered during the 1991 Gulf War

“I thought that bridges would be pretty easy to knock out with PGMs [precision guided munitions]—until I tried it. We would attack a bridge and get several hits, and then we’d discover—holy mackerel!—the bridge was still standing,” Lt. Dave Giachetti, the 48th Tactical Fighter Wing’s specialist in bridge attacks said in an Air Force Magazine article.

The challenge was to hit a bridge at its weakest spot. If a bomb just hit the roadway, it just left a hole which could be patched up; the only way to drop a span of bridge was to hit abutments at either end.

This sort of bombing mission would be virtually impossible for Ukraine. While their air force is still able to fly, it is only carrying out a few sorties per day, with most of the air power being supplied by drones. Ukraine’s Bayraktar TB2s are taking a heavy toll of Russian vehicles, and even sinking patrol boatsand setting an oil facility over the borderin Russa ablaze. But the Bayraktar is only the size of a light aircraft and carries a payload of about 400 pounds at most, not nearly enough for the sort of 2,000-pound weapon needed to dent the Kerch Bridge.

“If we had the ability to do it, we would’ve already done it,” said Oleksiy Danilov, Secretary of the National Security and Defense Council of Ukraine, when asked about attacking the Kerch Bridgeon April 21. But he did add: “If there is an opportunity to this end, we will definitely do it.”

In particular, robotic boats – Uncrewed Surface Vessels or USVs – can be a useful means for carrying out kamikaze attacks. The idea goes way back to 16thcentury Hellburners, themselves an evolution of old fireships. These made their dramatic entrance during the Spanish siege of Antwerp in 1585, when the Spanish fleet was used to make a blockade across the harbor, the ships packed together to form a pontoon bridge. Italian engineer Giambelli sent three gunpowder-packed Hellburners into the Spanish blockade, with clockwork time fuses; the subsequent explosion sunk several ships, killed upward of a thousand Spaniards and shattered the blockade.

The manned speedboat which Houthi forces have used.

On April 15, Pentagon Press Secretary John Kirby told reporters that the latest package of security assistance to Ukraine would include a number of unspecified USVs but would not give details.

“It’s an unmanned surface vessel (USV) that can be used for a variety of purposes in coastal defense. I think I’ll just leave it at that,” Kirby told reporters. “I’m not gonna promise you a fact sheet [but] I can promise you the damn thing works.”

When asked whether the USVs could be armed, Kirby said “They’re designed to help Ukraine with its coastal defense needs….I’m not going to get into the specific capabilities.”

“Although the USVs could be equipped with explosives and used to carry out kamikaze attacks, I would wonder about the opportunity costs,” analyst Zak Kallenborn— Research Affiliate at the Unconventional Weapons and Technology Division at the National Consortium for the Study of Terrorism and Responses to Terrorism (START) – told me. “I suspect Ukraine would be better served with the technology to convert existing commercial boats for remote operation.”

Kallenborn points to the manned speedboats which Houthi forces have used for attacks on a variety of vessels including a Saudi Frigate back in 2017. In principle a ship of any size can be modified for uncrewed operation; an 1,800-ton cargo vessel recently made a successful 400-mile journeythrough congested seaways off Japan.

“If the Houthis can do it, why not Ukraine?” asks Kallenborn.

An uncrewed submarine or UUV would be even harder to intercept. There have been no reports of such vessels being supplied to Ukraine at this time, though the U.S. does have a number of large and very large robot submarines under development, such as the U.S. Navy’s Orca XLUUVwhich might have the ability to emplace explosive charges under a bridge across a strait. Or the job might be done by much smaller craft placing explosives one piece at a time. (Hamas have tried to attack Israeli forces with a small kamikaze robot submarinein 2021).

The countdown to the destructionof the Kerch Strait Bridge is timed to coincide with the start of Russia’s Victory Day celebrations on May 9. A successful attack would be a humiliation for Russia, as well as cutting a vital supply line. In response to Danilov’s comment, Kremlin spokesman Dmitry Peskov warned that an attack on the bridge would bring severe retaliation. Most likely the website is simply an attempt to cause alarm, and perhaps tempt Russia into moving forces to protect the ten-mile length of the bridge from air, sea, or undersea attacks. Or it might be a way of distracting from a possible attack elsewhere, perhaps even in Moscow itself.

The countdown may simply be trolling; trolls have a thing for bridges. But given Ukraine’s previous unexpected successes, such as sinking Russia’s Black Sea flagship, and expanding arsenal of high-tech weapons, there will probably be people in Crimea wondering if they ought to get out now.