The Kremlin said on Tuesday it was impossible for Russia to return to the Black Sea grain export deal until an agreement related to Russian interests was honored, rebuffing a call by U.N. Secretary-General Antonio Guterres for Moscow to rejoin.

Guterres on Monday urged Russia to resume allowing Ukraine to export grain safely from its seaports despite what Russia calls its "special military operation," in line with a proposal he had made to President Vladimir Putin.

But the Kremlin suggested Guterres' proposal did not address its main complaint: that there had been no progress on a related agreement that was designed to facilitate Russian food and fertilizer exports amid Western sanctions imposed in response to the war.

"Indeed, Mr. Guterres' letter again set out some kind of action plan and contained promises that at some point it would be possible to implement the Russian part of these arrangements," Kremlin spokesperson Dmitry Peskov told reporters.

"Unfortunately, at the moment, it is impossible to return to the deal because it (the Russia-related agreement) is not being implemented, and de facto, it has never been implemented."

Peskov said Putin had made clear, however, that Moscow would be ready to revive the deal when the memorandum related to Russia was fulfilled.

The deal, brokered by the U.N. and Türkiye last July, aimed to help prevent a global food crisis by allowing grain blocked by the war in Ukraine to be safely exported.

Peskov said it would be important for Russia to discuss grain supplies with African countries at a Russia-Africa summit on Thursday and Friday.

Russia has spoken of the possibility of supplying cheap or free grain to Africa's poorest nations.