Volyntsev proposed using nuclear weapons to strike Ukraine's Beskydy Tunnel, a rail route in the Lviv region that is reportedly used to transport Western weapons used by Ukraine's Armed Forces.

He said it would be "very difficult" to destroy with conventional weapons, given that tunnels are "the most reliable bomb shelters."

The destructive power of nuclear weapons is much greater, the physicist said.

Volyntsev suggested using "small hydrogen bombs" to conduct a "gentle nuclear strike" on the tunnel "in order to block the main supply routes."

"Yes, some radioactivity will be induced. But this is an option that does not leave a large radioactive contamination of the atmosphere and load on the soil," he said. "Yes, there will be casualties…but everything can be done with minimal destruction."

Volyntsev described the conflict as it stands as "a war of attrition."

"Without Western assistance, everything would have ended long ago. How can this Western assistance be cut off?" he asked. "It is necessary to block the flow of weapons, other materials and equipment that allow the Ukrainian regime to exist."