Iran regrets Ukraine's decision to downgrade ties over the reported supply of Iranian drones to Russia, the Iranian foreign ministry spokesperson said on Saturday.
Nasser Kanaani said Ukraine should "refrain from being influenced by third parties who seek to destroy relations between the two countries", a ministry statement said.
Ukraine said on Friday that it would downgrade diplomatic ties with Iran over Tehran's decision to supply Russian forces with drones, a move President Volodymyr Zelensky called "a collaboration with evil".
Kanaani said Ukraine's decision was "based on unconfirmed reports and resulted from a media hype by foreign parties".
Military authorities in southern Ukraine said on Saturday they had shot down at least seven Iranian drones, including six Shahed-136 "kamikaze" craft, over the sea near the ports of Odesa and Pivdennyi on Friday.
These included - for the first time in Ukraine - a Mohajer-6, a larger Iranian drone, the southern military command said.
Ukrainian presidential adviser Mykhailo Podolyak said in an English language tweet on Saturday that Iran was supporting Russia "by giving modern drones to (a) backward country for the murders of Ukrainians".
US President Donald Trump said on Saturday he had been told about the concept of a deal with Iran, but was waiting for the exact wording, while warning there was still the possibility of restarting strikes on the country if Tehran misbehaves.
The Israeli military issued an urgent warning on Sunday to residents of 11 towns and villages in southern Lebanon, urging them to evacuate their homes and move at least 1,000 metres (3,300 feet) away to open areas.
Ukrainian drones attacked Russia's Baltic Sea port of Primorsk on Sunday, temporarily setting it on fire, local governor Alexander Drozdenko said on the Telegram messaging app, as Kyiv launched a wave of strikes on targets across the country.
An Israeli court has extended by two days the detention of two activists arrested aboard a Gaza-bound flotilla that was intercepted by Israeli forces in international waters near Greece, their lawyer said on Sunday.
Heavy rains that hit northeastern Brazil over the last 48 hours have killed at least six people and displaced thousands in the states of Pernambuco and Paraiba, the federal government said in a statement on Saturday.