d3.js force cancel a drag event

I have a simple drag event - and if a certain condition is met, I'd like to force cancel the drag currently under way (basically as if you were doing a mouseup).

Something like so:

var drag_behavior = d3.behavior.drag()
.on("drag", function() {
    if(mycondition){
       // cancel the drag event
    }
});

EDIT:

the goal is simply to prevent people from dragging a world map outside certain boundaries in such a way that renders the map in mid-ocean (details below).

Current map code:

var width = window.innerWidth
var height = window.innerHeight

var projection = d3.geo.mercator()
    .scale((width + 1) / 2 / Math.PI)
    .translate([width / 2, height/1.5])
    .precision(.1);

var path = d3.geo.path()
    .projection(projection);

var drag_behavior_map = d3.behavior.drag()
.on("drag", function() {
    drag_click = true //used later to prevent dragend to fire off a click event
    d3.event.sourceEvent.stopPropagation();

    // original idea
    // if(worldmap_left_boundary > 0 || worldmap_right_boundary < screen.height){
    //    cancel or limit the drag here
    // }
});

var svg = d3.select("#map").append("svg")
    .attr("width", width)
    .attr("height", height)
.call(drag_behavior_map)

Basically this should not be possible.