Russia has begun delivering nuclear weapons to Belarus, including some that are supposedly three times as powerful as those detonated over Hiroshima and Nagasaki, Belarusian President Alexander Lukashenko announced Wednesday.

The tactical nuclear warheads are the first Russia has moved since opening its invasion of Ukraine last year. The weapons’ arrival comes one week after Ukrainian forces began a large scale counteroffensive against Russia. Lukashenko argues the weapons will only serve as a deterrent.

“We have missiles and bombs that we have received from Russia,” Lukashenko told Russian and Belarusian state media. “The bombs are three times more powerful than those [dropped on] Hiroshima and Nagasaki.”

“We have always been a target,” Lukashenko said. “[Western countries] have wanted to tear us to pieces since 2020. No one has so far fought against a nuclear country, a country that has nuclear weapons.”

Tactical nuclear weapons, which are intended to destroy enemy troops and weapons on the battlefield, have a relatively short range and a much lower yield than nuclear warheads fitted to intercontinental ballistic missiles that are capable of obliterating whole cities.

Belarus shares a border with three NATO countries – Lithuania, Latvia and Poland – and has sided solidly with Russia in the conflict over Ukraine. Lukashenko has allowed Russian forces to travel through Belarus to more effectively encompass Ukraine, though he has yet to deploy troops of his own in the conflict.

“God forbid I have to make a decision to use those weapons today, but there would be no hesitation if we face an aggression,” Lukashenko said of the nuclear weapons on Wednesday.