Why This China's New Xian H20 Bomber Worry America?

Chinese H20 Stealth Bomber Prepares to Counter B21 Raider;
The H20, dubbed "Storm" by analysts, is poised to enhance China's longrange striking capabilities, potentially reaching as far as the U.S. West Coast.

In this Video Comparisons have been drawn between the Xi'an H20 and U.S. stealth bombers the B21 Raider.