Did Ukrainian Christians gather in the snow to pray about the Russian invasion in 2022? No, that's not true: This photo was taken in Ukraine, but it was in 2019, so it predates the events of 2022.
The claim appeared in a Facebook post (archived here) on February 17, 2022. The caption reads:
Ukrainian Christians pray outdoors, in the snow, for their country in this phase of war danger.
Tomorrow will be a day of fasting and prayer organized by local church officials in Ukraine.
Let's pray for our Christian family in Ukraine, in the face of these particularly critical times; may God grant wisdom, discernment, strength, courage, protection to His children, to the authorities and to the whole population!
This is what the post looked like on Facebook at the time of writing:
(Source: Facebook screenshot taken on Thu Feb 24 16:31:02 2022 UTC)
A reverse image search of the picture in the Facebook post resulted in a link to the International Mission Board website. An article on the website from 2019 accompanied the picture. The author of the article writes about being in Ukraine in 2019 praying with Ukrainian citizens over the state of their country. The caption on the Mission Board website with the photo (screenshot below) is "On Our Knees - Ukrainians kneel and pray in the snow in Kharkov's city square."
(Source: IMB.org screenshot taken on Thu Feb 24 15:16:45 2022 UTC)