Tanks are the apex predator on Ukraine's battlefields, with modern Western tanks facing off against Soviet-designed relics. But which country has the power?
American warships and bases in the Pacific are within reach of an increasingly worrying threat, a missile force unlike anything the US has faced in combat.
China's ever-expanding Rocket Force is armed with thousands of missiles with ominous nicknames such as "carrier killers" and the "Guam Express."