Why did Paul VI strip József Mindszenty of his archbishopric?

József Mindszenty was appointed Primate of Hungary and Archbishop of Esztergom in 1945. There existed a mutual animosity between him and the Hungarian government, which culminated in his imprisonment for treason, and later his confinement for many years at the American embassy as a political asylee. Pope Paul VI eventually secured a deal that permitted him to leave the embassy in exchange for exile from Hungary. In 1973, While Mindszenty was in exile, Paul VI supposedly pressured him to voluntarily resign the primacy and archbishopric. When that did not work, he unilaterally stripped Mindszenty of his titles. However, he refused to appoint a successor to the vacant offices. This raises the following questions: Why did Paul VI want Mindszenty to give up his offices? Was this simply a matter of him being unable to effectively discharge his duties while in exile? If so, what was the point of leaving the offices vacant? If it was rather a purely political move aimed at placating the Hungarian authorities, why did the latter not include this condition in the original deal? Did the Church ever publish an official reason for relieving Mendszenty of his titles? (I wasn't sure whether it was more appropriate to ask this question here or on the [History Stack Exchange](https://history.stackexchange.com/) , but as our own [tour](https://christianity.stackexchange.com/tour) solicits questions about "the history of denominations (such as Roman Catholic…)" I thought I'd try here first.)