We're into territory where someone temporarily blind to Vietnam can be argued against by someone temporatily blind to all the various Hungarian Revolution-type oppressions, and Afghanistan hasn't been good for either 'side', either time.
Toppling regimes, propping up regimes and outright taking over control of countries has happened both ways.
Now, the US has not recently claimed territory of another sovereign nation, unlike Russia, although both have 'intervened' abroad to advance some cause or other in their own (direct or indirect) interests. And the cold light of history may well colour the various incidents (and fill in with currently unknown details) differently from how either side's supporters currently understand the situation.
Charitably, Russia is not actually interested in personal expansion but doesn't want various non-Russian influences to encroach from various directions, so is doing what it can to understandably prevent that. America is absolutely averse to border chamges but has been required to react against groups (governmental or non-governmental) within those borders whom they see as most disrupting the trans-border situation in various ways. But each aim tends to clash indirectly in many ways, and the biggest problems are where the attempts may directly clash.
The modern world (arguably after the rise of independent media coverage in Vietnam, for the west, not so sure about Russia, but perhaps post-Soviet glasnost, and China is an interesting question that I'm not sure there's yet a definitive answer for in this form) is different from what came before, mostly now being small atrocities (as if they are any better) where large ones may once have been, and... I'm going into difficult discussion territory, well beyond my intended point.
(Which was that I can't see agreement on who will start WW3. But it probably will be best ascribed to at least two parties, neither of whom intended to start it.)