Russo-Ukrainian War: Ukraine begins its Kharkiv counteroffensive, surprising Russian forces and retaking over 3,000 square kilometers of land, recapturing the entire Kharkiv Oblast west of the Oskil River, within the next week.

The Russo-Ukrainian War began in February 2014 and is ongoing. Following Ukraine's Revolution of Dignity, Russia occupied and annexed Crimea from Ukraine. It then supported Russian paramilitaries who began a war in the eastern Donbas region against Ukraine's military. In 2018, Ukraine declared the region to be occupied by Russia. These first eight years of conflict also included naval incidents and cyberwarfare. In February 2022, Russia launched a full-scale invasion of Ukraine and began occupying more of the country, starting the biggest conflict in Europe since World War II. The war has resulted in a refugee crisis and hundreds of thousands of deaths.

On September 6, 2022, the Armed Forces of Ukraine launched a major counteroffensive against the Russian military during the Russian invasion of Ukraine. As Ukraine announced the start of the Kherson counteroffensive in southern Ukraine in late August, Ukrainian forces also began a second counteroffensive in early September in Kharkiv Oblast, in eastern Ukraine.

Kharkiv Oblast, also referred to as Kharkivshchyna, is an oblast (province) in eastern Ukraine.

The Oskil or Oskol is a south-flowing river in Russia and Ukraine. It arises roughly between Kursk and Voronezh and flows south to join the Siverskyi Donets which flows southeast to join the Don. It is 472 kilometres (293 mi) long, with a drainage basin of 14,800 square kilometres (5,700 sq mi).

September 6 is the 249th day of the year in the Gregorian calendar; 116 days remain until the end of the year.