Two articles written to support Yankee in Chinese city (5)

'chinese city' is the definition.

'two articles written to support yankee in' is the wordplay.
'two articles' can mean two substitutions for 'article'.
'article' becomes 'an' (indefinite article).
'article' becomes 'an' (indefinite article).
'written to support' means one lot of letters go next to another (in a down clue, some letters hold up others).
'yankee' becomes 'y' (phonetic alphabet: alpha, bravo, charlie etc.).
'in' indicates putting letters inside.
'an' put after 'y' is 'yan'.
'an' inserted inside 'yan' is 'YANAN'.