I find the terminology odd.
I thought soldiers were taken prisoner, not taken hostage.
Actually, the Russians have a history of using prisoners as hostages. It is a long read but you may find the following paper interesting: EVEN ONE IS TOO MANY: AN EXAMINATION OF THE SOVIET REFUSAL TO REPATRIATE LIBERATED AMERICAN WORLD WAR II PRISONERS OF WAR
http://www.aiipowmia.com/research/wadley.html
Appears that many thousands of Allied POWs imprisoned in Eastern Germany (and other Central European countries under Nazi control) were “liberated” by advancing Soviet forces and then subsequently disappeared without trace inside the Soviet Union.
If these Georgians are ever seen again, count them lucky.