Russian officials have warned Ukrainians in occupied Kherson that they may be "deported" if they don't accept Russian passports, the U.K. Ministry of Defence said Monday.

"Russia is using passports as a tool in the 'Russification' of the occupied areas, as it did in Donetsk and Luhansk before the February 2022 invasion," the ministry on Twitter.

Residents of Kherson have been warned of penalties for those who don't accept Russian passports by June 1. Some may be removed from the territory or may have their property seized, according to the U.K.

Russia said Sunday that the U.S. has denied visas to Russian journalists who wanted to cover Foreign Minister Sergey Lavrov's trip to New York.

Lavrov promised that the decision will not be forgotten by their side.

"The country that calls itself the strongest, smartest, most free, fairest has chickened out, has done a silly thing and shown what its sworn assurances on protecting freedom of speech, access to information and so on are worth," he told reporters at the airport before his flight to New York.

"Most importantly, you can be sure: we will not forget, we will not forgive this," the minister told the pool of journalists who have not been granted U.S. visas.

The journalists had planned to cover Lavrov's appearance at the United Nations to mark Russia's chairmanship of the Security Council.

Russian Deputy Foreign Minister Sergei Ryabkov called the U.S.’s decision “outrageous” on Sunday, Interfax, a Russian news agency, reported.

There was no immediate comment from the U.S. State Department about the claim of refused visas, according to AP.

-ABC News’ Anastasia Bagaeva, Edward Szekeres, Natalia Shumskaia

Over 16,000 Ukrainian soldiers trained in the European Union, Josep Borrell, an EU representative for Foreign Affairs and Security Policy, said Friday.

The EU has delivered over $600 million of ammunition and missiles to Ukraine, according to Borrell.

-ABC News' Oleksiy Pshemyskiy

The Russian Defense Ministry reported that ammunition from a Russian Su-34 military aircraft fell in Belgorod, a city in the southern region of Russia.

"On the evening of April 20, during the flight of the Su-34 aircraft over the city of Belgorod, an abnormal descent of an aviation munition occurred," the agency said.

The ministry claimed buildings were damaged but there were no immediate reports of victims. An investigation is underway, according to the agency.

-ABC News' Will Gretsky

Belarusian President Alexander Lukashenko arrived on a state visit to China on Tuesday, according to Sputnik, a Russian state-owned news agency.

During his planned three-day visit, Lukashenko will hold a series of meetings with top Chinese officials, according to Sputnik.

Belarus has been an unofficial ally of Russia since the war began.

Lukashenko's visit comes at a time when Western officials have issued warnings about the Chinese government possibly aiding Russia in its invasion.

U.S. Secretary of State Antony Blinken and NATO Secretary General Jens Stoltenberg said they have intelligence showing China is preparing to send lethal aid to Russia.

Last week, the Chinese foreign minister visited Russian President Vladimir Putin in Russia. During remarks at that meeting, Putin said he is planning for Chinese President Xi Jinping to visit Russia this spring.

-ABC News' Natalia Shumskaia