North Korea had warned of a possible missile launch or nuclear test for late December and soon after made a cryptic reference to a possible "Christmas gift" for the U.S. This of course caused a big reaction from the U.S. Four spy planes were sent to Korean Peninsula in reaction to the possible threat of a nuclear war.
The U.S. aircraft were detected by Aircraft Spots, an aviation tracking site, according to a report by South Korea's Yonhap News Agency.
The site claims that four U.S. planes -- identified as RC-135W Rivet Joint, E-8C, RQ-4 Global Hawk and RC-135S Cobra Ball -- flew their missions between Christmas Eve and early Christmas Day, the report said.
The first two planes flew at 31,000 feet while the Global Hawk flew at 53,000 feet, the tracking site said. Meanwhile, the Cobra Ball and a refueling plane flew over the East Sea.
Trump stressed that the U.S. was prepared to deal with any kind of "gift" the North might send.
"We'll find out what the surprise is, and we'll deal with it very successfully," Trump told reporters at his Mar-a-Lago resort in Florida, according to Yonhap. "Everybody's got surprises for me, but let's see what happens. I handle them as they come along."
--The Associated Press contributed to this story.
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