Pyongyang’s official Korean Central News Agency said North Korea had finished reprocessing 8,000 spent nuclear fuel rods, which experts say would provide enough weapons-grade plutonium for at least one more nuclear bomb.

The claim may not mean much, since North Korea is believed to already have enough weaponized plutonium for half a dozen nuclear weapons. But the timing—a day after Pyongyang warned it would beef up its nuclear arsenal if the U.S. refused to agree on bilateral talks—shows the communist regime is flexing its atomic might to push Washington to act, analysts said.

“North Korea is trying to show off its nuclear might as a way to pressure the United States to agree to the talks,” said Kim Yong-hyun, a North Korea expert at Seoul’s Dongguk University.