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Nothing that really needs to be said except that I find it utterly hilarious that the same people who are now talking about taking on Russia, China and Iran just managed to lose a twenty year long war in Afghanistan.
If At First You Don’t Succeed, Pretend You Never Tried
Raghead The Fiendly Neighbourhood Terrorist 
In 1990, the USSR collapsed, and the US managed to put in Yeltsin who let the CIA run Russia as the USSR disintegrated. The PRC knew that they only managed to defeat the US in the DPRK in 1951 because they had the Soviet MAD umbrella that protected the PLA from hundreds of Hiroshimas and Nagasakis. And now the CIA had dismantled that umbrella. When Putin started rebuilding, he did it secretly, knowing that the US could demand regime change and he would have no alternative but to comply. Russia always agreed with the US in the Security Council.
The PRC also knew the US could demand Taiwan, Hong Kong, regime change, and what could the PRC do about it without that umbrella? So the PRC began building its military very quietly, and always agreed with the US in the Security Council.
US military intelligence know that, now, the Russian military is just as it was in 1999, and the PRC military is as it was in 1800, when the Chinese Navy was just junk(s), and the Chinese air force was just coloured kites. They are sure nothing could possibly have changed, so Russia and the PRC will be easier for the US than Grenada y Panamá.
The atomic scientists say the Doomsday Clock is 100 seconds before midnight. Bunch of Pollyannas, those atomic scientists.