It comes as Ukraine's president says only the US can provide security guarantees leading to an end to the war.

Ukraine launched a new offensive in Russia's Kursk region Sunday, Moscow and Kyiv said. Ukrainian forces had captured about 500 square miles of the western Russian province in a surprise incursion in August,

Ukraine struck overnight a Russian oil depot that serves a military airfield in the Russian city of Engels, Ukraine's military said on Wednesday.

Russia launched 38 Shahed drones into Ukraine. The air defense shot down 28 Russian drones, according to the Ukrainian Air Force. From 7:30 p.m. on January 6 to 9 a.m. Kyiv time on January 7, Russia attacked with 38 Shahed-type attack drones and various types of imitator drones from the directions of Millerovo,

Russia uses its "shadow fleet" to evade sanctions on its energy exports. This murky network of vessels uses deceptive tactics to move around.