Attempt to run out non-striker

Can a bowler run out the non-striker after he has entered his delivery stride?

YES and NO

NO - according to the Laws of Cricket (Law 42.15), the bowler can only attempt to run out the non-striker after he has started his run-up and before he reaches his delivery stride.
When the bowler is in his delivery stride, the non-striker will expect him to release the ball and therefore cannot be given out.
If the bowler throws the ball at the non-striker's stumps and misses, the umpire will call and signal Dead ball.

YES - the situation is slightly different in International Cricket. The ICC regulations say that 'the bowler is permitted, before releasing the ball and provided he has not completed his usual delivery swing, to attempt to run out the non-striker. Whether the attempt is successful or not, the ball shall not count as one of the over. If the bowler fails in an attempt to run out the non-striker, the umpire shall call and signal Dead ball as soon as possible.'

Nowhere in the Laws of Cricket nor the ICC regulations does it mention that the bowler has to warn the batsman. Traditionally, the bowler does warn the non-striker in the Spirit of the Game.

In the highlighted incident in the ODI, the captain of the fielding side withdrew the appeal and play continued but the batsman still continued to leave his ground before the ball was released






Read more about Law 38 (Run out) and Law 42.15 (Unfair play) at the MCC website