One correction in regards of my post with the map attached (see above), in regards of the situation in Hajjah province (NW Yemen, on Saudi border and the coast of the Red Sea): the YNA didn't drive all the way from Harad to Abs after all.

Namely, after capturing the upper part of Harad, the YNA stopped its advance on Abs and tried to outflank the Houth/YA positions in lower Harad by advancing down the coast. The YNA captured most of the farms in this area, and secured all the hills, in turn securing the road from Midi to Hara too.

But, now comes the best part: while mopping up the area west of Harad, YNA discovered a big system of tunnels. Reportedly, this is extending for nearly 30km and connecting the area around Harad with the Saudi border.

Now, no doubt: this sounds fantastic. But, keep in mind: Houthis are controlling this area since at least five years, without interruption. Plus, existence of such tunnels would in turn explain the ability of the Houthi/YA/Saleh forces to 'suddenly appear behind' Saudi outposts on the border, back in autumn last year (mind all the 'spectacular' videos of knocked out M1s, M2/3s etc.).

The capture of this tunnel system is also an explanation for why this offensive was launched (and the last-before-last cease-fire breached) and why the Houthis/YA are not launching any forays into Saudi Arabia, this year. Indeed, these tunnels might be an explanation why Houthis asked for negotiations almost immediately after the YNA secured the area (and tunnels).