The mainstream or imperialist media have turned black into white (something they do all the time , folks !) by saying that the US cannot trust the DPRK because of past behaviour . In fact it is the other way round .
In 1994 the DPRK signed the DPRK-US Agreed Framework , it froze its nuclear industry , including the civil nuclear power industry , at great cost to itself . Huge economic losses were caused in the DPRK by the shutdown of the nuclear industry . In return the US was meant to supply heavy oil, construct Light Water Reactors , lift the sanctions and move towards normalising diplomatic relations . None of this happened .
The US during the period of the DPRK-US Agreed Framework made false allegations that the DPRK had developed an underground nuclear weapons base .This was proved to be untrue.
On the 19th of September 2005 , an accord was agreed at the 6-party talks between the DPRK and 5 other countries including the US , however the US scuttled this by imposing sanctions on a bank in Macao, China that the DPRK used for international banking transactions.
Moreover more than one US administration has either stated or signed agreements to the effect that it respects the DPRK 's sovereignty and territorial integrity but at the same time the US has openly and covertly schemed for 'regime change' in the DPRK by funding numerous regime change operations , by increasing hostile propaganda against the socialist system of the DPRK and by parading dubious individuals styling themselves "north Korean defectors " in the US media ,
No sir , it is the US that is the unreliable dialogue ! Now it is making far -fetched and evidence free allegations about missile development