20,000 Year Old Footprints Show Humans Have Been Longer Than

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I meant Ainu in Japan were never isolated from other Northeast Asians.

Australia+New Guinea+Tasmania (Sahul) was isolated from Asia when pleistocene land bridges existed.
First Australians had to cross tens of kilometers of open sea - and we're still not sure how they did it.

They likely weren't completely isolated until Europeans came, Polynesians and Asians were capable of sailing to Australia and AFAIK the Dingo dogs were brought to Australia from Southeast Asia tens of thousands years later than the first humans - a clear indication that later migrations did happen, too.

The mosaic of ancient migrations gets more complex the more we know.

In the same way the ancestors of Indo-European speakers (corded ware and beaker people) spread from the Russian steppes and overran Europe removing the paleolithic populations that existed there. the ancestors of northern Asians spread southward displacing the indigenous populations. changing the original profile of the peoples who originally occupied east Asia, south-east Asia and parts of the pacific. These groups also migrated into north and South America eliminating or absorbing the indigenous populations.