Biden can retaliate without effect on hostage deal, Washington says.
"Pakistan is a major non-NATO ally of the United States. That will remain the case, but we would urge restraint in this case," a State Department spokesman said.
White House National Security spokesman John Kirby said the US is taking away the Houthis' capability with "each and every strike."
Russia used North Korean missiles against Ukraine earlier this month, firing several at the city of Kharkiv on January 2.
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The sale comes as Israel intensifies its offensive in the Gaza Strip. The US has pressed Israel to minimize civilian casualties in Gaza and has called to scale down the war in the coming weeks.
Such an evacuation could be "more difficult than any previous operations in recent memory," the Post reported, potentially involving Air Force aircraft or Navy warships.
The agency has been releasing increasingly serious travel advisories since war broke out in Israel, and is now urging all US citizens to leave Lebanon ASAP, raising questions of what's to come.
Biden spoke about the humanitarian assistance to Gaza on his way back to Washington from Israel early Thursday morning.
Members of the Islamic Jihad and PFLP have taken part in events held by a recipient of US State Department grants.