Ukraine will do everything possible to achieve the internationally recognised borders of 1991, there is a plan for the de-occupation of Crimea, Commander-in-Chief of the Armed Forces of Ukraine Oleksandr Syrsky said.

In an interview with the British newspaper The Guardian, the colonel general said that Kyiv has a plan to return Crimea, more than ten years after Vladimir Putin illegally annexed it.

When asked if this is really feasible, Syrsky said yes.

"It’s realistic. Of course, it’s a big military secret," the general said. He continued: "We will do everything we can to reach the internationally recognised borders of 1991 [when Ukraine voted for independence from the USSR]. We have to win … to liberate our citizens who are in the occupied territories, who are suffering."

Ukraine's armed forces were successfully using long-range kamikaze drones to strike deep inside Russia, he said. So far they had targeted "about 200 critical infrastructure sites."

Speedboat-like sea drones, meanwhile, had sunk about a third of Russia's Black Sea naval fleet.

"It really became a trap for them and for some [vessels] a grave," Srysky said.

The Kremlin, he added, has been forced to "completely pull out" from the Crimean port of Sevastopol, after a series of Ukrainian attacks. A key Ukrainian objective is to destroy the Kerch road and rail crossing connecting the occupied peninsula with Russia. Syrsky declined to say when this might happen.