the largest shifts in global gio strategic power that the world has witnessed. and it only happens once in a while. >> reporter: experts say that part of beijing's goal here is to deter the u.s. if beijing decided to use force to take taiwan. it also says that if beijing achieves its 2027 military modernization goals, it would give it a large range of options when it comes to tie huang. it could potentially launch an amphibious invasion or conduct a blockade. but also really important context here is that even with this expansion as of now, beijing still lags far behind the u.s. in terms of numbers. accord being to the stockholm international research institute, peace research institute, china has 350 nuclear warheads in its stockpile, compare that to 3,750 for the u.s. and russia's 4,630. but, laura, china repeating the stral strategy is all just for defense. >> selena wang live for us in tokyo. thank you so much.