Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
### Context:
CREATE TABLE table_name_51 (nationality VARCHAR, position VARCHAR, player VARCHAR)
### Question:
Which Nationality has a Position of defense, and a Player of nikita korovkin?
### Answer:
SELECT nationality FROM table_name_51 WHERE position = "defense" AND player = "nikita korovkin"