Iran’s Foreign Minister Mohammad Javad Zarif arrived in the Austrian capital of Vienna Saturday to launch sensitive talks with the P5+1 group of countries ahead of next week’s deadline for a final agreement on Tehran’s nuclear program, according to Press TV.

The Iranian minister left Tehran for Vienna early Saturday to attend the last round of nuclear negotiations before a self-imposed June 30 deadline.

Zarif is expected to meet US Secretary of State John Kerry who arrived in Vienna late Friday.

Iranian diplomatic sources close to the negotiations had said earlier that Kerry, EU foreign policy chief Federica Mogherini, German Foreign Minister Frank-Walter Steinmeier, British Foreign Secretary Philip Hammond and French Foreign Minister Laurent Fabius would also join the talks on Saturday and Sunday.

However, there is no word yet on whether Russian Foreign Minister Sergei Lavrov and his Chinese opposite number Wang Yi will also be present for the talks.