Grain export shipments from Ukraine resumed on Wednesday as Russia said it was rejoining a deal brokered by the United Nations (UN) and Türkiye to establish a safe Black Sea corridor.

Turkish President Recep Tayyip Erdogan told parliament that "shipments will continue from 1200 today (0900 GMT) as planned", after a call between the Russian and Turkish defense ministers.

Russia also confirmed that it was resuming its participation in the Ukraine grain deal, saying it had received "sufficient" guarantees from Kyiv on de-militarizing the maritime corridor. 

"Russia considers that the received guarantees are at the moment sufficient and is resuming the implementation of the agreement," the defense ministry said in a statement. 

Moscow had pulled out at the weekend, saying it could not guarantee the safety of civilian ships crossing the Black Sea because of a drone attack on its fleet there. Ukraine has said that was a false pretext.

UN Secretary-General Antonio Guterres welcomed Russia's return to the deal, a UN spokesperson said on Wednesday, and is continuing his engagement with all actors to push for the renewal and full implementation of the pact that could expire on November 19.

The UN chief also remains committed to removing the remaining obstacles to the exports of Russian food and fertilizer, said UN spokesman Stephane Dujarric.

The prices of wheat, soybeans, corn and rapeseed fell sharply on global markets following the announcement, which eased concerns about the growing unaffordability of food.

Ukrainian President Volodymyr Zelenskyy said earlier that the world should respond firmly to any Russian attempts to disrupt Ukraine's export corridor across the Black Sea, which was blocked after the conflict between Russia and Ukraine began on February 24.

The blockade has exacerbated food shortages and a cost of living crisis in many countries as Ukraine is one of the world's biggest suppliers of grain and oilseeds.

In a Tuesday night video address, Zelenskyy said ships were still moving out of Ukrainian ports with cargoes thanks to the work of Türkiye and the UN.

"But a reliable and long-term defense is needed for the grain corridor," Zelenskyy said.

The grains deal aimed to help avert famine in poorer countries by injecting more wheat, sunflower oil and fertilizer into world markets and ease a steep rise in prices.

(With input from AFP and Reuters)