Thousands of Ukrainians attend Unity March in downtown Kharkiv.

The funds will be used to purchase "thousands of air defense systems, missiles, and automated turrets to shoot down drones," U.K. Defense Minister John Healey said.

The Ukrainian military said on Dec. 16 that Russian troops are launching their fiercest attacks on the western outskirts of Pokrovsk while also ramping up pressure on Myrnohrad, its sister city nearby.

Russia rejects Christmas truce over concerns that it could give Ukraine a temporary respite in the war, Kremlin spokesperson Dmitry Peskov said on Dec. 16.

"Neither de jure nor de facto will we recognize Donbas as Russian," Zelensky told reporters on Dec. 15 following the second round of talks in Germany.

Russia's central bank has filed a lawsuit seeking 18.2 trillion rubles ($229 billion) in damages from Euroclear, escalating Moscow's dispute with the Belgium-based securities depository as the EU considers how to use frozen Russian assets to support Ukraine.

In a joint statement issued Dec. 15, European leaders outlined a six-point security and recovery framework for Ukraine, committing to long-term military support, a European-led and U.S.-supported multinational force operating inside Ukraine, and legally binding measures to respond to any future attack.

Ukrainian forces hit the Astrakhan gas processing plant on Dec. 15, targeting what Kyiv described as a "key enterprise in Russia's oil and gas industry," the General Staff reported.

Quantum Systems and Frontline Robotics announced on Dec. 15 a joint Ukrainian-German venture to launch the first "industrial-scale" foreign-based production of drones for Ukraine's military.

Encircled Russian troops in Kupiansk are still getting limited drone drops — and a Ukrainian official says some included flags, not food.

For the first time, Ukrainian underwater drones have successfully attacked a Russian submarine, Ukraine’s Security Service (SBU) reported on Dec. 15.