俄罗斯周三释放了斯蒂芬·哈伯，这位74岁的美国教师，在被关押超过四年后获释。他曾被判定为为乌克兰从事雇佣兵活动，美国称这些指控是捏造的。以下是需要了解的情况。
Russia on Wednesday released Stephen Hubbard, a 74-year-old American teacher, after holding him as a prisoner for more than four years. He had been convicted of working for Ukraine as a mercenary, charges that the U.S. said were fabricated. Here's what to know.
哈伯先生，这位74岁的教师，被关押超过四年，原因是美国国务院称为捏造的指控。
Mr. Hubbard, a 74-year-old teacher, was held for more than four years on what the State Department called fabricated charges.