In the techniques shown in this video Uke restrains Tori's right wrist and applies a neck choke from the rear.

At a time of 0.45 Uke applies a neck choke from the rear. Tori induces Uke to apply Aiki by Tori lowering his body as he bends his right arm to the front. This action causes Uke to momentarily relax his upper body and prepare his legs to extend upwards to resist the downward motion. Uke pushing upwards causes the muscle torque about the foot joint of his feet to be in the opposite direction to that required for him to resist Tori pulling him to the front by bending his arm. Uke is unbalanced to the front. Aiki-Lead

At a time of 1.28 Uke applies a neck choke from the rear. Tori induces Uke to apply Aiki by Tori lowering his body as he turns his body to the front. This action causes Uke to momentarily relax his upper body and prepare his legs to extend upwards to resist the downward motion. Uke pulling upwards causes the muscle torque about the foot joint of his feet to be in the opposite direction to that required for him to resist Tori pulling him to the front. Uke is unbalanced to the front. Aiki-Lead