President Volodymyr Zelenskyy said on Friday he had visited the northern Sumy region, from where Ukraine launched a major incursion into the neighbouring Russian Kursk region, Paralel.Az reports citing Reuters.

Almost two months into the surprise operation, Kyiv's troops control swathes of Russian border territory, though the pace of the advance has slowed and Moscow's forces have begun to counterattack.

"It is crucial to understand that the Kursk operation is a really strategic thing, something that adds motivation to our partners, motivation to be with Ukraine, be more decisive and put pressure on Russia," Zelenskyy said on Telegram.

Shown alongside his top army commander, General Oleksandr Syrskyi, visiting the 82nd Air Assault Brigade, the president thanked the military for defending Ukraine's territorial integrity.

He said the incursion, which Ukraine says is bringing war back to Russia, "has greatly helped" Kyiv to secure the latest military support packages from the West.

"We need to motivate the whole world and convince them that Ukrainians can be stronger than the enemy," he told the servicemen.

Zelenskyy added that he had held a meeting with his military command, which had discussed the front lines, air defences and the energy situation in the Sumy region. Russia has been pummelling its electricity infrastructure, leading to power cuts.