A senior cybersecurity official at the Pentagon said he quit because he thought it was impossible for the U.S. to compete with China on Artificial Intelligence (AI).

Nicolas Chaillan joined the U.S. Air Force as its first chief software officer in August 2018. He worked to equip it and the Pentagon with the most secure and advanced software available.

But Chaillan quit on September 2. In his departing LinkedIn post, he cited the Pentagon’s reluctance to make cybersecurity and AI a priority as a reason for his resignation.

Speaking to the Financial Times in his first interview since leaving, Chaillan said China is streets ahead of the United States.