UK: (male) friendly, likes to be fancy, likes tea, speaks in a British accent most of the time
UK's Children: America, Canada, Australia, New Zealand, former British colonies

USSR: (male) friendly, brave, sometimes arrogant, speaks in a Russian accent most of the time, enjoys vodka
USSR's Children: Russia, Ukraine, Belarus, former Soviet Socialist Republics

Backstory: These countries were hostile during the Cold War but now in a modern AU, they have a interesting lover dynamic.