North Korea regularly makes claims about the progress of its nuclear and missile programmes, but analysts say most of them are impossible to independently verify.
North Korea has carried out a “successful” ground test of a new rocket engine to launch satellites, state media says.
Kim Jong-un, the country’s leader, asked scientists and engineers to make preparations for a satellite launch as soon as possible, KCNA reported.
It is the latest in a series of missile-related tests this year.
Meanwhile, the US and China have agreed to step up co-operation at the UN to address the North’s fifth nuclear test.
The underground nuclear test, conducted earlier this month, is thought to be the country’s most powerful yet.