Playing Sibir, I beat Astrachan several times which gave me access to their maps. To prepare for the inevitable Russian onslaught I tried to enter the alliance of Turkey, Crimea and Algiers. I had good relations with them and royal marriages. But in the diplomacy screen the option to enter their alliance was never highlighted. Why that? I had it highlighted with foes like Russia, Astrachan and Persia! (And I wasn´t member of any alliance up till now, of course.)
Hartmann
P.S.: Because of this in the end I had to face Russia alone. They gobbled up most of my newly accquired western territories (Volgograd and Uralsk) at fast speed and I was only able to stop them through constant guerilla- and winterwarefare at Orenburg. But if no miracle occurs (i.e. Poland or Sweden declaring war on Russia) I will be doomed in the long run...
Hartmann
P.S.: Because of this in the end I had to face Russia alone. They gobbled up most of my newly accquired western territories (Volgograd and Uralsk) at fast speed and I was only able to stop them through constant guerilla- and winterwarefare at Orenburg. But if no miracle occurs (i.e. Poland or Sweden declaring war on Russia) I will be doomed in the long run...