Tom Clancy already predicted in 1987's Red Storm Rising that the next major conventional war in Europe would be very much WW1 like
At least the Soviet Army in that book was competent, and the technology gap has widened even more since then
Iceland may not provide soldiers, but it's a critical piece of land that can shut down Russian fleet's (especially subs) access to the Atlantic.
The Tom Clancy novel Red Storm Rising, written in 1986, depicts a fictional NATO-Warsaw Pact conventional war and features Iceland as an important battleground
The Amazon paperback explicitly lists it as a Jack Ryan book, too. No. Not unless there's been a rewrite where Ryan makes a cameo.
Larry Bond was co-author and shares the copyright. I could have sworn the first copy I saw credited him on the cover with Clancy, but all the images of covers I've seen since just have Clancy. (The current paperback calls it a Jack Ryan novel, which, no.)
Divided and Entwined and Emperor come to mind. Both are highly militaristic polit thrillers
Speaking of Tom Clancy, his earlier works were a hell lot better than later ones, and I find the standalone Red Storm Rising to be his most enjoyable novel. If there's anything among HP fanfics that resonates with this story, it's Hermione Granger and the Marriage Law Revolution
Yeah, Tom Clancy used to be king of the action novel. Red Storm Rising is a masterpiece.
My 2c.
I suggest LOTR, it's quite an incredible read. The Dark Materials is also excellent. I also like Tad William's Otherland series. 4 books, a long read, but his imagination is pretty epic. And if you're into sci-fi, and metaverses, and virtual worlds, you'll have a lot of fun.
Also, I like Tom Clancy's books. Try grabbing Red Storm Rising if you can. It's a bit long, and jam-packed with military detail, but I love that kind of stuff.