President Donald Trump addresses the nation from the White House on the ballistic missile strike that Iran launched against Iraqi air bases housing U.S. troops, Wednesday, Jan. 8, 2020, in Washington, as Vice President Mike Pence and others looks on.

WASHINGTON (AP) — President Donald Trump says Iran appears to be “standing down” and that no Americans or Iraqis were harmed in Iran’s Tuesday ballistic missile strike on two Iraqi bases housing U.S. troops.

The Iranian strikes came just days after Trump authorized the targeted killing of Gen. Qassem Soleimani, the head of Iran’s elite Quds Force.

Trump reiterated his position that “Iran will never be allowed to have a nuclear weapon,” adding that Americans should be “extremely grateful and happy” with the outcome.

Speaking from the foyer of the White House, Trump announced the U.S. will immediately place new sanctions on Iran “until Iran changes its behavior.”

Trump defended his targeted killing last week of Soleimani.

He also called for new nuclear negotiations to replace the 2015 nuclear deal from which he withdrew the U.S., and announced he would ask NATO to become “much more involved in the Middle East process.”

Iran’s attack was its most direct assault on America since the 1979 seizing of the U.S. Embassy in Tehran.