Artist unknown. Google Image Search came up blank.
Cross reference between A Colder War by Stross and Crooked by Grossman.
“Long-range missiles with hybrid thermonuclear and necromantic payloads. Grafted and crossbred infantry divisions. Strategic alliances with folkloric, extraplanar, and subterranean entities. Field deployment of weaponized paleofauna. Large-scale saturation of target areas with invasive fungal and floral xeno organisms. Megadeaths and mega-undeaths. This is the Cold War now.
Crooked by Austin Grossman