More than 20 Americans are missing in action on the front lines in Ukraine, with a spike in casualties over the past six months as foreigners fill urgent gaps in defenses, according to a CNN investigation.

A Russian drone struck a multi-storey apartment building in the northeastern Ukrainian city of Sumy early on Thursday, killing nine people and injuring 13, including a child, President Volodymyr Zelenskiy said.

Russian sabotage and reconnaissance groups pursue the attempts to cross into Ukraine in Chernihiv, Sumy, and Kharkiv regions, which border the Russian Federation. — Ukrinform.

A Russian drone strike in Sumy resulted in nine fatalities and significant damage to an apartment block. President Zelensky condemns the attack.- Watch Video on English Oneindia

Some 150 Ukrainian teenagers from northeastern areas near the frontlines of the war with Russia had already packed their bags to travel west for an educational retreat far from the shelling and fighting.

A Russian drone attack on a residential block killed nine people including three elderly couples in the eastern Ukrainian city of Sumy, officials said on Thursday.

Officials say a Russian drone has blasted a hole in an apartment building in northeastern Ukraine during a nighttime attack that killed at least six people and wounded nine others.

Russia launched a barrage of drones on Ukraine in an overnight attack on Friday, injuring four people and damaging a hospital and a grain warehouse in the southern Odesa region, officials said.

The Shahed drone destroyed a wall and the surrounding windows in the apartment block in Sumy, near the border with Russia. A Russian drone opened a hole in an apartment building in northeastern Ukraine during a nighttime attack,

Ukrainian military said Russia launched 81 drones overnight, 37 of which were shot down. At least four people have been killed and nine injured, including a child, in a drone attack on an apartment building in the northeastern Ukrainian city of Sumy.

Emergency crews continue to remove debris and conduct rescue operations at the site, says State Emergency Service of Ukraine - Anadolu Ajansı