He was the ninth metropolitan in Moscow to be appointed without the approval of the Ecumenical Patriarch of Constantinople as had been the norm.

[1] He is known to have opposed the supporters of the Josephites or non-possessors, and favored the opponents of monastic landownership.

Joasaph was the one to solicit young Ivan IV's forgiveness for the disgraced Belskys and prince Vladimir of Staritsa and render support for Maximus the Greek.

During the regency of Grand Duchess Elena Glinskaya, in the first five years of the reign of Ivan IV (1533–1538), Joasaph managed to keep his influence at the royal court, but in 1542, Joasaph fell into disgrace and was exiled to the Kirillo-Belozersky Monastery and then transferred to the Trinity-St. Sergius Lavra in 1547, where he would remain until his death on 27 July 1555.

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