The USA is worried about missiles. These can travel 20 the of sound. They are a problem for the . It could not stop Russia or China using missiles, so needs its nuclear . U.S. President Donald Trump will meet Russian President Vladimir Putin to talk about the arms .
Russia tested a hypersonic missile this . President Putin said Russia needs the weapons "unlawful " hurt Russia's . He said: " have failed to contain Russia." Mr Putin says the missiles can "strike like a ". The of a Russian in England month has made worse.