Joanna Kakasis

at a college in Russian-occupied eastern Ukraine.

Ukraine denies targeting the school and says it hit a Russian elite drone unit nearby.

But the Kremlin is also really agitated by Ukraine's use of long-range drones to target the lifeblood of the Russian economy, which is oil.

Ukraine has struck Russian oil refineries and depots as well as ports.

Zelensky said that the strikes have reduced Russia's oil refining capacity by 10 percent.

And the Institute for the Study of War in Washington, D.C., says these strikes have slowed Russian battlefield gains to almost zero.

We recently joined a Ukrainian military team as they launched these long range drones.

And at the request of Ukraine's military, which cites security reasons, we are identifying soldiers using their military call signs.

A soldier called Yuki watched the drone fly into the night sky.

And he said, these are Ukraine's versions of sanctions on Russia, our way of forcing the Kremlin into a peace that is fair to Ukraine.