"It will Get Harder" : Biden Thinks the World will Dramatically Reshape in 10 Years
"If I had started talking to you about hypersound many years ago, you would have taken me for a madman", - he added.
"A lot will change. ... It will get really harder", - the US president says. "Threats will be geographically more diverse than 20 years ago", - added the head of the White House.