Below will be a list of parallels between America and Russia
that I think would benefit any RusAme writer should they wish to incorporate
them into their works. While in canon there is minimal romantic substantiation,
this post merely aims to provide writers with tools that highlight the similar chemistries
and complexes that America and Russia both experience. In no way is this
forcing the ship onto anyone either.

Child Imagery:

America:

Both are equated to children, albeit in different aspects.

America is seen as young, brash, and inexperienced by older
nations [x] [x].

Ex: He categorizes the world into good guys and bad guys.

Russia:

Meanwhile, having been abused and traumatized in his
childhood, Russia later inflicts this same abuse onto others as an adult. He’s
described as child-like and is respectively noted to be unaware of his cruelty [x]. 

Point is, Russia isn’t cognitively aware of all this. I should also warn that
this abuse isn’t something that should be romanticized.

Instead, a more appropriate linkage would be the similar childish
perception of the world that he has.

Ex: He thinks that everyone he meets is his friend.

Ex: He naively believes that the Allies are his friends.
Lithuania has to point out to him that self-interest will always come first in
politics.

Weight Issues: 

Both are insecure about their weight and physique [x] [x] [x] [x]. 

Strength:

They both possess immense strength [x]. 

Loneliness and Fear of Being Alone: 

America:

At one point his only friends were Japan and England.

He struggled to make friends and was fully aware of the fact
that he wasn’t viewed in high regard by other nations [x]. 

Russia:

He’s had trouble making friends his whole life.