Not only do UFOs exist, we have patented how they can fly so fast … back in 1998:
http://barry.warmkessel.com/SAUCERS6.html
SLICK SAUCERS
Or
An Electro-magnet Aerodynamic Augmentation Device From Alpha Centauri
1. Patents #5,791,599 and #5,797,563. Patent disclosure 360329; 26 August 1994
Our MIC was not interested.
These are unclassified ideas. We posted the above web page in 2002.
The RUSSIANS launched their first hypersonic missile in 2004:

https://tass.com/defense/1395621?utm_source=barry.warmkessel.com&utm_medium=referral&utm_campaign=barry.warmkessel.com&utm_referrer=barry.warmkessel.com
Prototype Of Russia’s Hypersonic Weapon Tested Back In 2014(sic) — general – Feb 01, 2022
The Avangard boost-glide vehicle is capable of flying at a hypersonic speed of up to Mach 28 in the dense layers of the atmosphere
MOSCOW, February 1. /TASS/. Former Chief of Russia’s General Staff Army General Yuri Baluyevsky said that a prototype of a hypersonic weapon was tested in Russia back in 2004.
“I draw your attention to 2018, when [Russian President] Vladimir Putin said that Russia has a weapon that our adversaries don’t have at the moment and are unlikely to obtain in the near future,” he said in an interview with RBC on Monday. “I can even disclose the date now. In February 2004, I was the one who oversaw trials of a prototype of the flying vehicle, which is now being referred to as a hypersonic weapon.”