[chiph]

I would have thought there would have been a technology transfer amongst the spacefaring nations, so that just in case they could dock with each other.

[manarth]

That's basically the history of the APAS docking system [1], which was co-developed by American and Soviet engineers.

So why isn't it universal? As usual, XKCD has a compelling explanation: https://xkcd.com/927/

[1] https://en.wikipedia.org/wiki/Androgynous_Peripheral_Attach_...

[chillacy]

Also, China was apparently banned from the ISS in 1999 in order to prevent technology transfer.