Any tips for the single player level Deadly Trio? Have tried many times and failed.

The best trio I've ever had was Scandinavia, West Russia and Central Russia.
On the first turn I got West Russia.
On the second turn I got Central Russia.
On the third turn I got Scandinavia.
On the fourth turn I got Caucasus.
I had 5 + 4 + 4 + 3 + 5 = 21 income after just four turns.

Mark Jynx,

Pretty sure he is referring to this challenge level
https://www.warzone.com/SinglePlayer?Level=1234663

NeuroNautical,

Starting position has a huge influence on your team's chances of winning. Ideally, if you can grab the center tile (C7), or a tile that positions you to be near to one or both or your partners, makes the battle substantially easier.

Just make sure neither you nor your AI partners starts at IT7, not sure if its a design error or intentional, but that tile starts with 2 armies instead of 20 like the rest giving the player there a major disadvantage.

In summary, look at your AI companions 1st and 2nd choices are and pick the tile that you feel would let you best support them. Be prepared that if you choose the center, you have a 1/5 chance (in my experience) of getting it.

Thanks Jose! I had been going for the center initially, but it was easier once I started from the outside but alongside my allies holding three in a row.