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Russia struck Ukrainian ports on Tuesday, a day after pulling out of a United Nations.-backed deal to let Kyiv export grain, and Moscow claimed gains on the ground in an area where Ukrainian officials said Russian forces were going back on the offensive.

Russia described a wave of missile and drone attacks on Ukraine’s ports as “mass revenge strikes” in retaliation for attacks by Ukrainian seaborne drones that knocked out its road bridge to the occupied Crimean Peninsula.

Shortly after the bridge was hit on Monday, Moscow withdrew from a year-old U.N. brokered grain export deal, a move the United Nations said risked creating hunger around the world.

Falling debris and blast waves damaged several homes and unspecified port infrastructure in Russia’s main port, Odesa, according to Ukraine’s southern operational military command.

Local authorities in Mykolaiv, another port, described a serious fire there. A part of a Russian cruise missile Kalibr is seen inside a building damaged during a Russian missile and drone strikes, amid Russia’s attack on Ukraine, in Odesa, Ukraine July 18, 2023. via REUTERS

The Russian attacks on ports provide “further proof that the country-terrorist wants to endanger the lives of 400 million people in various countries that depend on Ukrainian food exports”, said Andriy Yermak, the head of Ukraine’s presidential staff.

Ukraine’s air force said six Kalibr missiles and 31 out of 36 drones were shot down.

Moscow, for its part, said it had foiled a Ukrainian drone strike on Crimea, with no major damage on the ground, and had reopened a single lane of road traffic on the Crimea bridge. Turkish-flagged bulker TQ Samsun, carrying grain under UN’s Black Sea Grain Initiative, transits Bosphorus in Istanbul, Turkey on July 18, 2023. REUTERS

Six weeks since Ukraine launched a counteroffensive in the east and south, Russia is mounting a ground offensive of its own in the northeast.

Russia’s defense ministry said its forces had advanced 2 km (1.24 miles) in the vicinity of Kupiansk, a frontline railway hub recaptured by Ukraine in an offensive last year. Kyiv acknowledged heavy fighting in the area and said Russia was making a major push there. Reuters could not independently verify the situation.

Since Ukraine began its counteroffensive last month, Kyiv has recaptured some villages in the south and territory around the ruined city of Bakhmut in the east but has yet to attempt a major breakthrough across heavily defended Russian lines. ‘A BLOW TO PEOPLE IN NEED’

The Black Sea grain export deal brokered a year ago by Turkey and the United Nations was one of the only diplomatic successes of the war, lifting a de facto Russian blockade of Ukrainian ports and heading off a global food emergency.

Ukraine and Russia are both among the world’s biggest exporters of grain and other foodstuffs.

If Ukrainian grain is again blocked from the market, prices could soar around the world, hitting the poorest countries hardest.

“Today’s decision by the Russian Federation will strike a blow to people in need everywhere,” U.N. Secretary-General Antonio Guterres said on Monday. A view shows a building damaged during a Russian missile and drone strikes, amid Russia’s attack on Ukraine, in Odesa, Ukraine on July 18, 2023. via REUTERS

Russia says it could return to the grain deal, but only if its demands are met for rules to be eased for its own exports of food and fertilizer.

Western countries call that an attempt to use leverage over food supplies to force a weakening in financial sanctions, which already provide exceptions to allow Russia to sell food.

Ukraine’s President Volodymyr Zelensky has called for the grain deal to continue without Russia’s participation, effectively seeking Turkey’s backing to negate the Russian blockade. Ukraine’s President Volodymyr Zelensky has called for the grain deal to continue without Russia’s participation. AFP via Getty Images

Turkish President Tayyip Erdogan, the deal’s sponsor, says he thinks Moscow can be persuaded to return.

Any attempt to reopen Ukrainian grain shipments without Russia’s participation would probably depend on insurance companies agreeing to provide coverage. Industry sources have told Reuters they are considering the implications.

Kremlin spokesman Dmitry Peskov said attempting to export grain from Ukraine without Russian security guarantees would carry risks, and said Ukraine used the waters for military activities. SLOW COUNTEROFFENSIVE see also Russian soldier ‘lost his grip,’ shot at comrades before being killed, Ukrainian intelligence says

Russia’s claim on Tuesday to have advanced around Kupiansk was a rare signal of Moscow attempting to go back on the offensive since Kyiv launched its counteroffensive last month.

Both sides have endured bitter losses in Europe’s bloodiest combat since World War Two, yet front lines have moved only incrementally since last November, despite a massive Russian winter offensive followed by Ukraine’s counterassault.

“For two days running, the enemy has been actively on the offensive in the Kupiansk sector in Kharkiv region,” Ukraine’s Deputy Defence Minister Hanna Maliar wrote on Telegram.

“We are defending. Heavy fighting is going on and the positions of both sides change dynamically several times a day.”

Oleksander Syrskyi, the commander of Ukraine’s ground forces, described the situation in that area as “complicated but under control.”

Serhiy Cherevatyi, the spokesperson for Ukraine’s eastern grouping of forces, said the Russian military had amassed more than 100,000 troops and more than 900 tanks in the area.

Ukraine’s counteroffensive has made limited gains near Bakhmut and along two major axes in the south, but its assault force equipped with billions of dollars worth of new Western weapons and ammunition has yet to confront the main Russian defensive line.

Kyiv says it is deliberately advancing slowly to avoid high casualties on fortified defensive lines strewn with landmines and is focused for now on degrading Russia’s logistics and command.

Moscow says the Ukrainian counteroffensive has failed.

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Technology

Uber opens ‘interest list’ for Waymo robotaxi rides in Austin

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Uber opens 'interest list' for Waymo robotaxi rides in Austin

Dara Khosrowshahi, CEO of Uber, speaking on CNBC’s Squawk Box outside the World Economic Forum in Davos, Switzerland on Jan. 22, 2025.

Gerry Miller | CNBC

Ride-hailing and food delivery app Uber is opening its “interest list” to users in Austin, Texas, who want to be first in line for Waymo robotaxis there.

The company said in a statement that users will “be able to travel across 37 square miles of Austin — from Hyde Park, to Downtown, to Montopolis” — when the Uber-Waymo service launches soon.

The so-called “interest list” allows users to receive Uber updates and bolsters their odds of being matched with a Waymo autonomous vehicle upon launch.

The vehicles that will be part of the Austin service are Jaguar iPace electric models equipped with Waymo’s driverless systems and labeled with both Waymo and Uber branding.

The Waymo rides in Austin will only be available through the Uber app, unlike in San Francisco and Los Angeles, where riders hail them through the Waymo One app.

In the face of investor pressure to step up its autonomous vehicle strategy after Tesla promised it would soon start producing robotaxis, Uber last year said it had begun testing a ride-hailing app with some of its employees.

While Tesla does not make vehicles that are safe to use without a human driver at the wheel, ready to steer or brake at all times, Elon Musk’s automaker in January said it will “begin launching” a driverless ride-hailing business “later this year” starting in Austin.

According to the Texas Department of Transportation, testing and operating a commercial robotaxi service in the state does not require the same types of special licenses and permits that other states require.

“Texas law allows for AV testing and operations on Texas roadways as long as they meet the same safety and insurance requirements as every other vehicle on the road,” a spokesperson for the department told CNBC by e-mail.

Uber CEO Dara Khosrowshahi is expected to discuss the impact of automated driving systems — or self-driving cars — on the company’s overall business and strategy on a fourth-quarter earnings call on Wednesday.

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Politics

Bybit fined $1M by India’s financial regulator over compliance violations

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Bybit fined M by India’s financial regulator over compliance violations

India’s financial regulator has fined Bybit $1 million for failing to register under the Prevention of Money Laundering Act, leaving its compliance status unclear.

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Science

Scientists Control Kelvin Waves in Superfluid Helium for First Time

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Scientists Control Kelvin Waves in Superfluid Helium for First Time

For the first time, researchers have successfully controlled and observed Kelvin waves in superfluid helium-4, marking a significant step in understanding energy dissipation in quantum systems. The study has provided a controlled method to excite these helical waves, which had previously only been observed in unpredictable conditions. The research opens new possibilities for studying quantised vortices and their role in energy transfer at the quantum level.

Controlled Excitation of Kelvin Waves

According to the study published in Nature Physics, also available on arXiv, Kelvin waves—first described by Lord Kelvin in 1880—are helical disturbances that travel along vortex lines in superfluid systems. These waves play a crucial role in energy dissipation within quantum fluids but have remained difficult to study due to the challenges of controlled excitation.

Associate Professor Yosuke Minowa from Kyoto University, the lead author of the study, told Phys.org that the breakthrough occurred unexpectedly. An electric field was applied to a nanoparticle decorating a quantised vortex with the intention of moving the structure. Instead, the vortex core exhibited a distinct wavy motion, leading researchers to shift their focus toward controlled Kelvin wave excitation.

Superfluid Properties and Quantum Vortex Behaviour

Superfluid helium-4, which exhibits quantum effects at macroscopic scales when cooled below 2.17 Kelvin, has no viscosity, allowing it to flow without friction. This unique state prevents energy from dissipating as heat, leading to the formation of Kelvin waves when disturbances occur in the vortex lines of the fluid. The research team demonstrated that these waves, rather than traditional fluid turbulence, provide an essential mechanism for energy transfer in superfluid systems.

Nanoparticles Used for Wave Visualisation

To track the motion of Kelvin waves, the researchers introduced silicon nanoparticles into superfluid helium-4 at 1.4 Kelvin by directing a laser at a silicon wafer submerged in the fluid. Some nanoparticles became trapped within vortex cores, making them visible under controlled conditions. A time-varying electric field was then applied, forcing oscillations in the trapped particles and generating a helical wave along the vortex.

Experiments were conducted across different excitation frequencies ranging from 0.8 to 3.0 Hertz. A dual-camera system allowed for three-dimensional reconstruction of the wave’s motion, confirming its helical nature.

Experimental Confirmation and Future Research

Prof. Minowa explained to Phys.org that proving the observed phenomenon was indeed a Kelvin wave required an in-depth analysis of dispersion relations, phase velocity, and three-dimensional dynamics. By reconstructing the vortex’s motion in 3D, the researchers provided direct evidence of the wave’s handedness, confirming its left-handed helical structure—something never experimentally demonstrated before.

To validate their findings, the team developed a vortex filament model, which simulated Kelvin wave excitation under similar conditions. These simulations confirmed that forced oscillations of a charged nanoparticle generated helical waves in both directions, aligning with experimental results.

The study introduces a new approach for studying Kelvin waves in superfluid helium, offering insights into the mechanics of quantised vortices. Future research may explore the nonlinearity and decay processes of Kelvin waves, potentially revealing further details about quantum fluid dynamics.

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