The US president says the country is learning a lot from the recent deadly accident at a military testing range in Russia.
Five specialists were killed in a rocket explosion while they were working on a ship in a region in the far north-west of the country.
Ross Cullen has more from Moscow.
Five specialists were killed in a rocket explosion while they were working on a ship in a region in the far north-west of the country.
Ross Cullen has more from Moscow.
IN: "Donald Trump says..."