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I agree with OSX - the RX is sold in many countries besides the US. Here's a sample that took me about one minute to find:
Australia: http://www.lexus.com.au/range/
UK: http://www.lexus.co.uk/#/ExploreRange/RX
South Africa: http://lexus.com.sa/EN/Models/RX/Overview.aspx
The US is only one market market among many for a Japanese vehicle.
The Lexus brand did not exist in Japan in the early years but the Lexus vehicles were still sold in Japan under the Toyota brand via badge-engineering. The almost identical Toyota Harrier was released in Japan about the same time as the original RX was released in the US.  talk  "