Jim Marshall wrote:
Can anyone offer a definitive clarification?
Of course I can't, because I'm just player, but I'm absolutely sure you're right here:
• Phase 11 is completed for all regions before completing phase 12 for all regions before completing phase 13 for all regions (as per the rules/player aid/board turn sequence)
English rulebook is clear about it (page 3):
Each phase must be completed before the next one is embarked on.
The same we can find in Polish rulebook on page 5. Moreover, example in Polish instruction is correct (page 18): after Swedish expansion from Prussia, Tatars expand from Ukraine into Lithuania and cancel each other out with Swedes.