Just tried again, to be sure about this:
It’s 3480 in a vanilla King-level game. I have an axeman and an archer because my scout just tripped over an upgrade village. Sweet. I have done nothing at all in the game yet but clear fog and find a couple of villages; one gave me the bow and arrows, the other gave me 30 culture.
I meet two civilizations this turn, Russians and Chinese. The Russians denounce me instantly right after I dismiss the first welcome screen. What? What did I do? The Chinese insult my army. What? What? What? My little army is as strong as I could reasonably hope at this point, since I’m still working on my third unit, a worker, and I’m being insulted the same turn I meet the enemy civilization, which is like me still in the ancient period.
Next turn the Chinese also denounces me. What have I done to deserve this? I haven’t even built my first worker yet, haven’t done anything at all except wander my first two units around a little, and in fact haven’t come anywhere close to the other civ borders.
So fine, I hunker down for 20 turns or so, build my first two cities, and build the great library to jump to iron working. I’m not bothering anyone, and my cities aren’t close enough to any other civ to piss them off. I meet the Japanese, and am shocked to discover they don’t denounce me on sight.
At this point the Russians, who had been marked as hostile after denouncing me, are suddenly said to be friendly. OK, fine. I trade luxury goods with them. Next turn after that, they declare war, throwing 8 units at me including several swordsmen. What, they discovered iron-working AND mined it, AND built 3 settlers, 2 swordsmen, 3 archers and 3 axeman while I’ve managed just 2 more archers? Nice handicap :)
So fortunately there is this tiny lake between me and “Russia”, which their units could easily go around, but don’t, so most of their units embark (optics too, I guess) and get annihilated in the water by the couple archers I’ve now managed to build. After the Russians drown their last axe-man, they surrender. Pathetic, really.
I can’t account for this behavior except for something being fundamentally wrong with the latest patch.