Ukrainian forces pull back again as Zelensky warns "millions will be killed" without US aid. Catch up here

Ukrainian forces have retreated from the village of Lastochkyne in the eastern Donetsk region, both sides confirmed on Monday, as Russian forces intensify attacks and continue to push west.

Lastochkyne is located about 5 km (about 3 miles) northwest of Avdiivka, where Russia raised its flag on February 18.

The retreat from the village comes as Ukrainian President Volodymyr Zelensky tells CNN that “millions” could die in Ukraine’s war with Russia if US lawmakers don’t approve President Joe Biden’s $60 billion aid request for Kyiv.

The Ukrainian leader also said former US President Donald Trump doesn't understand Russian President Vladimir "Putin will never stop."

“I think Donald Trump doesn’t know Putin,” Zelensky said. “I know he met him… but he never fought with Putin. (The) American army never fought with the army of Russia. Never… I have a better understanding,” he said.

Zelensky warned that Trump will be “against Americans” if he chooses to support Russia over Ukraine.

Here's what else to know:

• Prisoner swap: Russian opposition figure Alexey Navalny’s aides said Monday they “achieved a decision on his exchange” in a prisoner swap while he was still alive and imprisoned in a penal colony. Maria Pevchikh, one of Navalny’s closest advisers said on social media that “in early February, (Russian President Vladimir) Putin was offered to exchange Vadim Krasikov, a killer and an FSB officer who is serving a sentence for murder in Berlin, for two American citizens and Alexey Navalny."
• Navalny's body: The Kremlin says it was not involved with the decision to hand over Navalny's body to his family, after a week in which his mother said she was told her son's body was not at the morgue, then after seeing it, was threatened into having a private funeral.
• Navalny farewell: A public farewell to Russian opposition figure Alexey Navalny is expected to be held at the end of this working week, spokesperson Kira Yarmish said in a post on social network X on Monday. 
• Russian attacks: At least four people have died and six others wounded in Russian attacks over the past two days, Ukrainian authorities said. Two were killed in Sumy, another two were killed in southern Kherson.
• Ukraine investigates: Ukraine's Prosecutor General's office said Sunday it had launched an investigation into the alleged killing of a group of Ukrainian prisoners of war by Russian forces. Russian forces allegedly shot unarmed Ukrainian servicemen in the Bakhmut district in the eastern Donetsk region on Saturday, the office said.