Israeli Prime Minister Benjamin Netanyahu drew a red line – literally – on Iran’s nuclear weapons program Thursday during his speech at the United Nations, raising pressure on President Obama to follow suit.

Armed with a red marker and a crude cartoon drawing of a bomb, the Israeli leader told the world that it will be too late to prevent the “medieval” regime in Iran from terrorizing the world once it has enough enriched uranium. He said the United States and Israel see eye-to-eye on the issue.

“What I have said today will help ensure that this common goal is achieved,” he said. “Israel is in discussions with the United States over this issue, and I am confident that we can chart a path forward together.”

The speech comes as tensions between Netanyahu and Obama have reached new highs following the White House’s refusal to set red lines on Iran’s nuclear program. The Obama administration says it still believes sanctions can persuade Iran to change course, and that a military strike is not yet necessary.