A Russian military blogger said that a Sukhoi fighter plane had been downed while it was dropping air bombs.
One of Moscow's fighter jets has been shot down by Ukrainian forces, according to a military blogger with links to the Russian air force. Another pro-Moscow milblogger said that the Sukhoi Su-34 aircraft had been downed by a Western-supplied F-16.
I assume the bomber has to slow down to subsonic speeds to drop it's payload. Don't want to think about the forces acting on the payload if it were to drop at supersonic speeds.