re: 2 Astronauts Survive Russian Rocket Failure on their way to ISS

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The Challenger was a rocket failure as well, no?

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SRB. Solid Rocket Booster is what Challenger had go wrong (O-ring seals between segments).

Soyuz is liquid fueled using RP-1/LOX.

Same but different. For one thing..once an SRB is lit...you can't stop it....you can split the case down the side (det cord) but that's a destructive means only available on the pad. Liquid fueled....you can command a valve closed or shut down the engine.