Russia end grain export deal?

Russia has indicated the it will no longer follow the UN-brokered deal to allow grain carrying vessels to leave the Black Sea.

However, it seems some ships are still leaving Ukraine–

Tail-end of the vessel traffic? Not sure.
But it will definitely cause a couple of problems

  1. Vessels stuck in the conflict zone might be staying longer than expected
  2. Alternate routes for grain cargoes are possible e.g. Poland, Romania. But this will increase ton-miles, as well as have weather challenges