The below video provides instruction and demonstrations of various techniques for redirecting and addressing an attack in the form of a rear bear hug (ushiro dori) .  The techniques are performed by Master Koretoshi Maruyama, Founder of Aikido Yuishinkai.

The demonstrated techniques are:

Ushirodori kokyu nage (kotai level);
Ushirodori kotegaeshi (kotai level); and
Ushirodori  kata otoshi (demonstration only – kotai level).