Russian President Vladimir Putin has vowed to bring "destruction" to Ukraine in response to a drone attack on the city of Kazan, located roughly 620 miles from the frontlines of the ongoing conflict.

The strike in Kazan was part of an increasingly daring drone programme by Ukraine - Reuters Kyiv has begun attacking targets deeper inside Russia, such as within Chechnya, Siberia and the Arctic - Reuters Both sides of the war have pushed to make ...

"Whoever, and however much they try to destroy, they will face many times more destruction themselves and will regret what they are trying to do in our country," Putin said on Dec. 22.