US officials returned to Ukraine today for the first time since Russia invaded the country, according to a person familiar with the situation, reported CNN.

According to the report, the sources said that the diplomats entered the nation from Poland and headed to the western city of Lviv for a day.

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When US Secretary of State Antony Blinken visited Kyiv over the weekend, he assured Ukrainian President Volodymyr Zelensky that the US will send diplomats into the nation beginning this week.

The report states the sources confirmed that the department intends to regularly review the security situation for the diplomats’ day travels into Lviv.

According to the source and another source familiar with the discussions, the department is also reexamining the security situation in Ukraine more broadly after Russia bombed five railway stations in central and western Ukraine on Monday, the report said. The strikes occurred just hours after Blinken and Defense Secretary Lloyd Austin returned from a visit to Kyiv.

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“The Kremlin’s brutal tactics and utter indifference to human life are appalling. This is the latest example of attacks that have killed civilians and destroyed civilian infrastructure in the Russian government’s brutal war against Ukraine,” when asked about the recent bombings and the proposal to bring US diplomats back into the country, a State Department official responded, stated the CNN report.

“As the secretary said, US diplomats will return to Ukraine this week. We are constantly reassessing and evaluating the security situation with a view toward resuming Embassy Kyiv operations as soon as possible to facilitate our support to the government and people of Ukraine as they bravely defend their country,” the spokesperson added. 

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The report states, citing sources that while US ambassadors visiting Lviv on day visits do not go by train, trains are an important part of the Ukrainian war because they are one way that new military equipment enters Ukraine. In a diplomatic cable sent earlier this month, Russia advised the US against arming Ukraine.

Wladimir Klitschko, a member of Ukraine’s senior military defence and a former world boxing champion whose brother is the mayor of Kyiv, reportedly told CNN that no one, including diplomats, should be in Ukraine right now.

“If you’re on Ukrainian soil, it is not safe for anybody. Eventually, and we’ll look forward to have diplomats back in their embassies,” Klitschko said Tuesday.