sitting on a powder keg

"It's like we're sitting on a powder keg."

"Of course, we are worried. ... It's like sitting on a powder keg," said Enerhodar resident Alexander Lifirenko.

“We are sitting on a powder keg,” he said.

“We’re sitting on a powder keg.”

When you interviewed him before prison, you know, you would have no idea that he was sitting on a powder keg of lies.