Negotiations on an agreement that will allow Ukrainian grain to be safely exported across the Black Sea are scheduled for Wednesday, May 3, and all parties will participate in the talks, citing a senior Ukrainian source, Reuters reported.

 "Negotiations are scheduled for tomorrow. All parties ... hopefully there will be results," said the source, who declined to be named.

 An agreement brokered by the UN and Turkey last July allows for the safe export of grain stuck in ports as a result of the Russian invasion through the Black Sea.

 Russia has previously claimed an "impasse" over extending the deal beyond May 18, as a list of its demands to facilitate exports of its own grain and fertilizer had not been met.