The widely circulated photo, shared on social media by former Ukrainian first lady Kateryna Yushchenko Thursday night, shows the elderly man in a black cap approaching a Ukrainian soldier with a leather bag.

“Someone posted a photo of this 80-year-old who showed up to join the army, carrying with him a small case with 2 t-shirts, a pair of extra pants, a toothbrush and a few sandwiches for lunch,” Yushchenko wrote. “He said he was doing it for his grandkids.”

It’s not clear where the picture was taken, but it went viral Friday as Russia advanced its attack on Ukraine, bearing down on the capital of Kyiv.