SINGAPORE/TOKYO, April 14 (Reuters) - A third Iran-linked tanker was entering the Gulf via the Strait of Hormuz on Tuesday on the first full day of the U.S. blockade on vessels calling at Iranian ports, shipping data showed.

U.S. President Donald Trump announced the blockade on Sunday after weekend peace talks in Islamabad between the U.S. and Iran failed to reach a deal.

As the three vessels transiting the strait were not heading to Iranian ports, they are not covered by the blockade.

Panama-flagged Peace Gulf, a medium-range tanker, is heading to Hamriyah port in the United Arab Emirates, LSEG data showed.

The vessel typically moves Iranian naphtha, a petrochemical feedstock, to other non-Iranian Middle Eastern ports for export to Asia, Kpler data showed.