A Russian spy at the center of a secret operation to smuggle high-tech weapon components into Russia has left Japan after his activities were disclosed by The New York Times, a senior Ukrainian intelligence official said Thursday.

The operative, Maksim Vladimirovich Filchenkov, 49, had been working undercover in Japan as an employee of Russian state airline Aeroflot. Filchenkov’s role had been the focus of a Times investigation into how Russia exploited Japan’s weak espionage laws.

Filchenkov’s departure was first reported by the Yomiuri Shimbun, a major national newspaper in Japan. The newspaper said the Russian exited Japan after the Times published its investigation July 12. The Ukrainian official who confirmed the spy’s departure did so on condition of anonymity because he was not authorized to discuss intelligence publicly.

A new study uses age-stratified allele frequencies to map ongoing natural selection and rare pathogenic variants.

Kimi K3 is available today on Kimi.com, Kimi Work, Kimi Code, and the Kimi API. At launch, Kimi K3 will use max thinking effort by default, with low-and high-effort modes to be introduced in subsequent updates. We are currently working closely with inference partners and open-source maintainers to align technical details and ensure a reliable rollout across the ecosystem. The full model weights will be released by July 27, 2026. Further details on the architecture, training, and evaluations will be released alongside the Kimi K3 technical report.

Kimi K3 is the first open model to reach 2.8 trillion parameters. It marks the latest step in Kimi’s sustained push at the scaling frontier: for nine of the past twelve months, Kimi models have set the upper bound of open-model sizes.

Kimi K3 is built on Kimi Delta Attention (KDA) and Attention Residuals (AttnRes), two architectural updates designed to improve how information flows across sequence length and model depth. We have also scaled up Mixture of Experts (MoE) sparsity, effectively activating 16 out of 896 experts when paired with a Stable LatentMoE framework. Together with refined training and data recipes, these structural changes yield an approximate 2.5× improvement in overall scaling efficiency compared to Kimi K2, allowing the model to convert compute into intelligence more effectively.

New research examines how gravity can be reconciled with thermodynamics through the Gravity from Entropy theory.

Opus 5 is a step change improvement for the Opus tier powering long-running agents while delivering improvements in coding and professional work.

In recent years, several claims have been put forth suggesting that animals of different species address each other using receiver-specific calls that function as individual names. If accurate, this would demonstrate a capacity for symbolic social reference that has rarely been documented in nonhuman communication systems. To evaluate such claims, we propose three minimal criteria for identifying names: individual reference, symbolic represent ation, and shared meaning. We then review the evidence relevant to these criteria in the species for which name-like calls have been suggested: spectacled parrotlets, common marmosets, African elephants, and bottlenose dolphins. Together, these criteria provide a clear and theoretically grounded framework for exploring the use of name-like calls in nonhuman animals.

Researchers at the University of Würzburg have succeeded in detecting exceptionally robust electrical transport in a topological insulator. This could lead to new metrological applications. The work is published in the journal Nature Communications.

Metrology is the science of measurement. Its aim is to ensure that measurement results are comparable and reliable worldwide, for example, in industry or scientific experiments. So-called fundamental constants, or unchanging physical quantities such as the speed of light or Planck’s constant, play an increasingly important role in this context.

As their values are universal, i.e., independent of place and time, they enable the definition of highly stable units and ensure highly reproducible measurement results. Since 2019, the International System of Units, SI (short for Système international d’unités), has been based entirely on these constants.