Beijing’s ghosting of Defense Secretary Lloyd Austin and Joint Chiefs Chair Gen. Mark Milley comes as China continues launching missiles and positioning warships and aircraft in unprecedented military drills around Taiwan. Officials and experts say China’s silence is a shortsighted and reckless move that increases the risk of escalation in an already tense situation.

“If the [Chinese military] is operating more aggressively, and in closer proximity to U.S. forces with greater frequency, we’d need these mechanisms even more to promote a safe operating environment,” said Randy Schriver, who served as the top Pentagon official for Asia policy in the Trump administration.

U.S. military leaders strive to maintain open lines of communication even with potential adversaries such as China to prevent accidents and other miscalculations that could turn into a full-blown conflict.