This is some high class trolling by Russia's President Vladimir Putin:
Putin said he offered U.S. President Donald Trump in a recent phone call the chance to buy one of the hypersonic nuclear weapons Moscow is developing. He said Trump spurned the offer and replied that Washington was making its own.
Hypersonic weapons fly faster than Mach 5 or five times the speed of sound. Their high speed leaves little warning time for the target. There are currently no practical defenses against them.
While the U.S. spent an enormous amount on developing large aircraft carriers, 'stealth' airplanes and useless missile defenses, Russia spent much less to developed weapons that can defeat all three. Carriers are today, at least for Russia, India and China, not threats but large and juicy targets. Kh-47M2 Kinzhal Mach 12 capable missile carried by a MIG-31
Trump is wrong in claiming that the U.S. makes its own hypersonic weapons. While the U.S. has some in development none will be ready before 2022 and likely only much later. Hypersonic weapons are a Soviet/Russian invention. The ones Russia now puts into service are already the third generation. U.S. development of such missiles is at least two generations behind Russia's.
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That Russian radar can 'see' stealth aircraft has been known since 1999 when a Yugoslav army unit shot down a U.S. F-117 Nighthawk stealth aircraft. Russian air and missile defense proved in Syria that it can defeat mass attacks by drones as well as by cruise missiles. U.S.-made air and missile defense in Saudi Arabia fails to take down even the primitive missiles Houthi forces fire against it.
The new weapons Russia announced in March 2018 make strategic missile defense useless.
The U.S. military and its weapons are regularly hyped in 'western' media. But it has long been clear to (non-U.S.) experts that U.S. military technology is not superior to that of other countries. In several important fields Russian, Chinese and even Indian weapons have much better capabilities. The reason is simple. U.S. weapons are not developed or built with a real strategic need in mind. They don't get developed for achieving the most effect in an existential war against a capable enemy but to create profit.
The last is probably the only thing Trump knows about them.