Red Guardian (Alexi Shostakov) was born in Moscow, Russia and is the husband of Natasha Romanova. The couple became KGB operatives under The Soviet Union and were sent to assassinate soldiers of The United States. Later on Alexi and his wife were both imprisoned by the CIA. They were given a choice to either spend twenty years in a federal prison or help the Americans pick up more resources. It was all curtesy of Nick Fury and S.H.I.E.L.D.
The Red Guardian is an identity that was created as the Soviet equivalent of Captain America. Alexei Shostakov was one of the Soviet Union's most acclaimed test pilots whose heroism caught the attention of the KGB. They arranged for Shostakov to wed Natasha Romanoff, a top agent of the secret Red Room Academy, later known as the Black Widow.
Shostakov was an exceptional pilot, as well as a master hand-to-hand combatant, and was trained in espionage techniques by the KGB. He is also a good athlete with superb agility.
- David Harbour will be play as Red Guardian in Black Widow in the MCU