Ukrainian President Volodymyr Zelensky says he has visited troops near the town of Pokrovsk, where the fiercest front line battle between Russia and Ukraine is currently taking place, BBC reported.

Zelensky posted photos showing him meeting personnel at a command post in the Dobropillya sector, some 20km (12 miles) north of Pokrovsk in the Donetsk region.

Kyiv's top military commander, Oleksandr Syrskiy, said on Monday that Ukraine was increasing pressure on the Dobropillya front to "force the enemy to disperse its forces and make it impossible to concentrate their main efforts in the Pokrovsk area".

Russia has been trying to seize Pokrovsk - a strategic frontline town and logistic hub - for over a year, according to BBC.