Russian-appointed authorities in the southern Ukraine city of Kherson announced plans Wednesday to seek annexation by Russia – and the Ukraine response was that those authorities might as well ask to join ‘Mars or Jupiter.”

Kirill Stremousov, deputy head of the Russian regional military-civilian administration, also said that, by the end of May, a bank for converting money to Russian rubles will start operating in the region and ultimately will be integrated into the Bank of Russia. He said there were no plans to create a separate republic such as those sought in the eastern Donbas region.

“There will be no referendums,” Stemousov said of the annexation. “It will be a decree based on an appeal from the Kherson regional leadership to the Russian president.”

Kherson, a Black Sea port city of almost 300,000, is one of few major Ukraine cities to be under Russian control. Ukraine presidential adviser Mykhailo Podoliak dismissed the annexation plan.

“The invaders may ask to join even Mars or Jupiter,” he tweeted. “The Ukrainian army will liberate Kherson, no matter what games with words they play.”

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Latest developments:

►British Prime Minister Boris Johnson, visiting Sweden, pledged his country’s support should Sweden or Finland come under attack. Both nations are expected to announce as soon as this week whether they will seek membership in NATO.

►World Unite for Ukraine announced it will stream a benefit concert June 16 featuring music by Pink Floyd, AJR, Crash Test Dummies and other bands. Organizers hope to raise $10 million toward easing the humanitarian crisis in Ukraine.

►The Senate will take up a House-passed a package of about $40 billion in urgently needed aid for Ukraine, $7 billion more than President Joe Biden requested from Congress. Biden urged passage as soon as possible, saying he has “nearly exhausted” the existing aid money for Ukraine.

►Leonid Kravchuk, who led Ukraine to independence during the collapse of the Soviet Union and served as its first president, died Tuesday, Ukrainian officials said. He was 88.

Russian soldier in Ukrainian custody will be first to stand trial for war crimes

A 21-year-old Russian soldier alleged to have killed an unarmed civilian who was riding a bike in a village in the Sumy region of northeastern Ukraine on Feb. 28 will become the first person to stand trial for war crimes since the start of the war, Ukraine’s Prosecutor General Iryna Venediktova announced Wednesday.