Key Takeaways from the ISW:
- Ukrainian forces continue to advance within and near Kupyansk, and more details have emerged about the counteroffensive effort.
- Ukrainian forces began counteroffensive operations in September 2025 after relatively rapid Russian advances in the Kupyansk direction and infiltrations into Kupyansk itself.
- Russian forces launched 495 total missiles and drones against Ukraine overnight on December 12 to 13, heavily targeting energy infrastructure across the country.
- Ukrainian President Volodymyr Zelensky announced that he will hold discussions regarding a peace settlement with US and European delegations in Berlin in the coming days.
- Ukrainian forces recently advanced in the Kupyansk and Lyman directions. Russian forces recently advanced in the Lyman direction.
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