Semantically covert mandatives differ from the rest of the alternants in that they denote – “in addition to the necessary attributes of volition and futurity a degree of habituality and recurrence. The elements of 'futurity' and 'volition' are thus weakened to a considerable extent. The emphasis is not primarily on getting somebody to do something at some stage in the future;
it is on describing a state that takes effect whenever a particular situation occurs.” (Hoffmann
The above excerp, including the cite, from The Mandative Subjunctive in American English
A corpus based study on the use of mandative constructions
by Olga Vlasova
This pretty much is synonymous with the way insists is used. It implies a repeated and ongoing demand, and is exactly what has been reported (domestically, at least) regarding the American position on North Korea's Nuclear Weapons program.
As to the matter of your expectation in this case, the same document notes the following -
Following Biber et al. (2006:476,984), Johansson and Norheim (1988:30), Hoffmann
(1997:54) the following criteria of formality of the mandative subjunctive are adopted in the
1. register distribution of the construction;
2. the use of passive;
Concerning the first criterion, our data shows (see Tables 2.15, 2.16) that the mandative
subjunctive is most frequently used in the genre of newspaper writing. In British English Hoffmann notices the same surprising particularity of its use: “'world affairs' has a considerably higher frequency of mandative subjunctives than the text types 'applied sciences' and 'natural and pure sciences'.” (1997:19) Thus MS can not be regarded purely as a formal construction. Rather it is typical for the written massmedia coverage of recent events, that is, newsfeed.