North Korean leader Kim Jong Un vowed to bolster his nuclear forces at “maximum speed” and threatened to use them if provoked in a speech he delivered during a military parade that featured powerful weapons systems targeting the United States and its allies, state media reported Tuesday.

His remarks suggest he will continue provocative weapons tests in a pressure campaign to wrest concessions from the U.S. and other rivals. The parade Monday night was to mark the 90th anniversary of North Korea’s army — the backbone of the Kim family’s authoritarian rule — and comes as the country faces an economy battered by pandemic-related difficulties, punishing U.S.-led sanctions and its own mismanagement.