Two U.S. military veterans from Alabama who went to Ukraine to help beat back the Russian invasion are missing and feared to have been captured by Russian troops or Russian-backed separatists, their family members said.

Andy Tai Ngoc Huynh, 27, of Trinity, Alabama, and Alexander Drueke, 39, of Tuscaloosa, Alabama, haven’t been heard from for days after being in the Kharkiv region of northeastern Ukraine, near the Russian border, family members say.

Going to Ukraine was “not a decision he made lightly,” Huynh’s fiancé, Joy Black, told USA TODAY. “He’s got such a big heart and a lot of compassion for people in need.”

Huynh told her on June 8 that he would be unavailable for a few days. Black, 21, told USA TODAY she began to worry when she didn’t heard from him. She received a call on Monday from another soldier in his unit, saying the pair hadn’t met up at a rendezvous point during an operation. The caller told them other soldiers waited a day and conducted a drone search.

Whether they were captured isn’t known, said Black, whose family has since been in touch with the State Department and a Red Cross group in Ukraine that is also searching for the men.

“We’re just hoping for good news,” Black said.

The State Department said it was monitoring the “unconfirmed” report and was in contact with Ukrainian authorities. White House spokesman John Kirby stressed that the U.S. discourages Americans from fighting for Ukraine.

“It is a war zone. It is combat,” Kirby said. “If you feel passionate about supporting Ukraine there is any number of other ways to do that that are safer and just as effective. Ukraine is not the place for Americans to be traveling.”

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Latest developments

►Japanese budget airline Zipair Tokyo is dropping the “Z” logo on its aircraft because it has become a pro-invasion symbol in Russia.