he would only support the idea of reopening Russian ammonia exports through Ukraine if Moscow handed Ukrainian prisoners of war back to Kyiv.
[...]
"I am against supplying ammonia from the Russian Federation through our territory. I would only do it in exchange for our prisoners. This is what I offered the UN," he said in an interview at his presidential office.

The United Nations has proposed that ammonia gas owned by Russian fertiliser producer Uralchem be pumped by pipeline to the Ukrainian border, where it would be bought by the U.S.-based commodities trader Trammo.

The [Ukraine] pipeline is designed to pump up to 2.5 million tonnes of ammonia per year from Russia's Volga region to Ukraine's Black Sea port of Pivdennyi, known as Yuzhny in Russian, near Odesa.

It was shut down [by Ukraine] fter Russia sent its troops into Ukraine on Feb. 24.