North Korea on Monday fired another round of ballistic missiles off its east coast as Kim Jong Un‘s powerful sister issued warnings for the US.

What happened: Kim Yo Jong warned US forces halt military exercisesand said nuclear-armed Pyongyang could turn the Pacific into a “firing range.”

See also: North Korea’s food crisis has ‘worsened’, South Korea says, ‘but doesn’t look like… people are starving yet’

Kim’s isolated nation fired two projectiles from a multiple rocket launcheraimed at targets 395 km (245 miles) and 337 km (209 miles) away, state media KCNA reported.

“The 600mm multiple rocket launcher mobilized when firing … is a means of a tactical nuclear weapon” capable of “paralyzing” an enemy airfield, it said.

The new launches came two days after Pyongyang fired an ICBM into the sea off Japan’s west coast. which prompted Washington to hold joint air exercises with Seoul and Tokyo.

“The frequency with which we use the Pacific as a firing range depends on the action nature of US forces,” she said in a statement, while warning of the increased US presence after the joint air exercises.

“We have satisfactory technology and capabilities and will now focus on increasing the quantity of their forces,” Kim added.

“We reiterate that nothing has changed in our will to make the worst of the madmen who escalate tensions pay the price for their actions.”

Meanwhile UN spokesman Stephane Dujarric pushed North Korea resumes dialogue on denuclearization and “abstain immediately from taking any further provocative action” prohibited under UN Security Council resolutions.

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