Allies and Unions (Atomic Winter Map Game)

This is where you write down your alliances or your formed Unions. If you sign and alliance, then you have to help the country during war by sending resources and military equipment/soldiers. If you decide not, you may be kicked out or not trusted. During an algo, it will automatically add your country's name in it because of the alliance.

If it's a trade, than no. The country who signed it doesn't need to help you in war.