Ukraine has the right to self-defense, and the right to self-defense includes the right to strike legitimate military targets on the territory of the aggressor, Russia. This was stated by NATO Secretary General Jens Stoltenberg at a press conference at the NATO summit in Washington on July 10, UNN reports.
We have to remember that this is an aggressive war. Russia attacked its neighbor, violated their territorial integrity, and invaded Ukraine. (...) This is a violation of international law. And according to international law, Ukraine has the right to self-defense. We are helping Ukraine to realize this right to self-defense by providing Ukraine with weapons, ammunition, missiles, including long-range weapons, including... ATACMS. The right to self-defense includes the right to strike legitimate military targets on the territory of the aggressor, Russia
He noted that "certain restrictions have been lifted.