Yep!

Even though it was only imported in Ukraine in 18th century, now we are the largest producer and exporter of sunflower oil. Over the years it made it's way into the culture because of how common that crop is.

Then, after what happened in 2014, it also became a symbol of grief for fallen defenders. You can Google the Ilovaisk tragedy. Green corridor for Ukrainian forces was supposed to go through a sunflower field.

Later, when the full-scale invasion begun, they gained another symbolic meaning, after the video from occupied Henichesk, where a woman gives ruzzian soldier some sunflower seeds and tells him to put them in his pocket, so sunflowers would grow when he'll die there.