For your first situation, it depends on why the pitch was illegal, but in no case do the runners return. Assuming the IP was one where it is a delayed dead ball, refer them to the illegal pitch penalty listed below 6-1-4 and the illegal pitch exception listed below 6-2-3. Here they are:
Quote:
PENALTY: (Arts. 2, 3, 4) Illegal pitch. The ball is dead at the end of playing
action, if the ball is pitched. A ball is called on the batter, and base runners
are awarded one base without liability to be put out (See 6-2-3 Exception).
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Quote:
EXCEPTION: If the pitcher completes the delivery of the ball to the batter and the batter
hits the ball fair or foul, or becomes a base runner, the coach of the team at bat shall have
the option of the result of the play or the penalty for an illegal pitch. A delayed dead ball
will be signaled by the umpire by extending the left arm horizontally.
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If it was an IP that results in an immediate dead ball, (e.g. foreign substance), then technically, the passed ball never happened, a ball is awarded to the batter and the runners are advanced (6-2-2 PENALTY).