Russian forces have been slowly grinding their way through Ukrainian lines along several parts of the frontline this northern hemisphere summer, throwing forth continuous waves of infantry as Moscow seeks to press home its advantage in men and munitions.
Russian troops have already pushed into northern Ukraine's Sumy region during the past months, carving out a small foothold there.
"I dedicated two days to working with units in Kharkiv region," Syrskyi wrote in a post on the Telegram app.
He said he spent the time talking to commanders, studying the situation in the area and the needs of troops there.
"The Russians are looking to press with numbers but we have to be ready, use appropriate tactical and technological solutions not to allow the (Russian soldiers) to move forward," Syrskyi said.
Russia's anti-aircraft systems downed 120 Ukrainian drones overnight, mostly in regions bordering Ukraine, the Russian Defence Ministry said on Sunday, reporting no damage.
More than three years into the war, Ukraine has increasingly been using drones to attack targets deep inside Russia.
The Defence Ministry said the drones that were intercepted overnight included 30 over the western Bryansk region, 29 in the Kursk region and 17 in Belgorod - all of which share a border with Ukraine.
Another 18 drones were downed over the Oryol region, which borders Kursk and has been hit by previous Ukrainian drone attacks targeting oil facilities.
Russia's civil aviation authority, Rosaviatsiya, said it had lifted restrictions introduced overnight to ensure safety due to the drones at airports in St Petersburg, Kaluga, Moscow and Nizhny Novgorod.Â
