You could just as well cite the velocity of the ISS in its elliptical orbit around the Sun, which is identical to that of the Earth in context of your question.
The relative velocities of the the two spacecrafts is very great at launch.
The difference is minimized by selecting a suitable launch direction and time relative to the rotation of Earth and the orbit of the ISS in relation to the launch site of the crew transfer spacecraft.
For more on that in general terms see this website, also online as of 15 March 2017:
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"Rendezvous and Docking: A User’s Guide for Non Rocket Scientists (Part 1)
by Terry Burlison"
• http://www.baen.com/rendezvous
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• https://en.wikipedia.org/wiki/Space_rendezvous#Phases_and_methods
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Barnes say: They have to run very fast indeed.
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anonimitie say: By travelling at the same speed.
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