Ukraine’s president, Volodymyr Zelenskiy, has urged the international community to take immediate steps to end a Russian blockade of his country’s ports in order to allow wheat shipments and prevent a global food crisis.

After the Black Sea port of Odesa was struck by missiles on Monday, Zelenskiy said: “For the first time in decades there is no usual movement of the merchant fleet, no usual port functioning in Odesa. Probably this has never happened in Odesa since world war two.

“Without our agricultural exports, dozens of countries in different parts of the world are already on the brink of food shortages. And over time, the situation can become downright terrible … This is a direct consequence of Russian aggression, which can be overcome only together – by all Europeans, by the whole free world.”

One person was killed and five injured when seven missiles hit a shopping centre and a depot in Odesa, Ukraine’s armed forces said. Air raid sirens sounded as the missiles interrupted a meeting between Charles Michel, president of the European Council, and the Ukrainian prime minister, Denys Shmyhal, forcing them into a bomb shelter.

Michel said he saw silos full of grain, wheat and corn unable to be exported. “This badly needed food is stranded because of the Russian war and blockade of Black Sea ports, causing dramatic consequences for vulnerable countries,” he said. “We need a global response.”

There was no let-up in fighting elsewhere, with Russian strikes on targets in the east and south and a renewed push by Kremlin’s forces to defeat the last Ukrainian troops holding out in a steelworks in ruined Mariupol.

At least 100 civilians remained trapped in the plant, which remained under heavy Russian fire, an aide to the Mariupol mayor said on Tuesday. Full control of the city would allow Moscow to create a land bridge between the Crimean peninsula, which it annexed in 2014, and eastern regions run by pro-Russian separatists.

Air raid sirens could be heard across several regions of Ukraine early on Tuesday, including in Luhansk, Kharkiv and Dnipro. The governor of Luhansk reported “very serious battles” in the frontline areas of Bilogorivka and Rubizhne. In the town of Bogodukhov, north-west of Kharkiv, four people were killed and several homes were destroyed in Russian attacks on Monday, local media quoted Kharkiv officials as saying.

In the US, congressional Democrats have reportedly agreed to provide as soon as Tuesday a further $39.8bn in additional aid for Ukraine, exceeding president Joe Biden’s request last month for $33bn including more than $20bn in military assistance. Senate leaders were prepared to move quickly to enact the proposal, reports said, which includes an additional $3.4bn for military aid and $3.4bn in humanitarian aid.

Biden said: “This aid has been critical to Ukraine’s success on the battlefield. We cannot allow our shipments of assistance to stop while we await further congressional action.

Only Ukrainians can put an end to the blockade

But you cut gas flow ,so chop your weat russia fo flair their gas