Iran's foreign minister has complained to the United Nations about Saudi Arabia's "provocations" towards Tehran, as a diplomatic crisis between the region's two major powers entered its second week.

In a letter to the U.N. Secretary-General Ban Ki-moon published by Iranian news agencies on Saturday, Mohammad Javad Zarif said "some people" in Riyadh seemed bent on dragging the whole region into crisis.

The two powers, both major oil exporters, have been locked in a diplomatic battle since Saudi Arabia executed Shiite cleric Nimr al-Nimr on Jan. 2. Iranian protesters then stormed the Saudi embassy in Tehran, prompting Riyadh to sever relations.