Russia is advancing around Kostyantynivka and in the Sumy region with small, fast-moving units as both sides try a new tactic of using motorcycles and civilian cars to quickly cross open terrain.

Russian forces have launched a large-scale drone assault across Ukraine, where officials said three people were killed and 64 others wounded.

Mykhailo Drapatyi, a 42-year-old general who took command as Ukraine pushed for military reform, said he replaced half of the leaders under him.

Since then, Russia and Ukraine have swapped dozens of prisoners of war, focusing on under-25s and the severely wounded and sick. There are hopes they could build into some of the biggest exchanges in the war that was triggered by Russia's 2022 invasion of Ukraine.

Trump has generally veered away from overtly criticizing Putin while openly berating Ukraine's leader Volodymyr Zelensky, but has repeatedly condemned Russia's lethal airstrikes and floated that the Kremlin could be "tapping us along."

Ukrainian officials say three people were killed and 13 were wounded when Russia attacked the country with waves of drones and missiles.

The convoy consisted of military trucks and buses carrying army personnel, with 20 soldiers killed in the attack.