KYIV, Ukraine (AP) — Ukrainian President Volodymyr Zelenskyy said Sunday the daring military incursion into Russia’s Kursk region aims to create a buffer zone to prevent further attacks by Moscow across the border.

It was the first time Zelenskyy clearly stated the aim of the operation, which was launched on Aug. 6. Previously, he had said the operation aimed to protect communities in the bordering Sumy region from constant shelling.

Zelenskyy said “it is now our primary task in defensive operations overall: to destroy as much Russian war potential as possible and conduct maximum counteroffensive actions. This includes creating a buffer zone on the aggressor’s territory — our operation in the Kursk region,” he said in his nightly address.

This weekend, Ukraine has destroyed a key bridge in the region and struck a second one nearby, disrupting supply lines as it pressed a stunning cross-border incursion that began Aug. 6, officials said.

Pro-Kremlin military bloggers acknowledged that the destruction of the first bridge on the Seim River near the town of Glushkovo will impede deliveries of supplies to Russian forces repelling Ukraine’s incursion, although Moscow could still use pontoons and smaller bridges.