Did former Russian leader Nikita Khrushchev attend John F. Kennedy's funeral?

No, but many others did, and the funeral was shown on USSR television.

Quote:
Not since the funeral of Britain's King Edward VII in 1910, had there been such a large gathering of presidents, prime ministers, and royalty at a state funeral.[9][15] In all, 220 foreign dignitaries, including 19 heads of state and government, and members of royal families, from 92 countries, five international agencies, and the papacy attended the funeral.

https://en.wikipedia.org/wiki/State_funeral_of_John_F._Kennedy

The Soviet Union's Deputy Premier Mikoyan attended the funeral.

https://jfkfacts.org/top-russian-at-jfk-funeral-u-s-does-not-want-to-involve-us/

His importance and stature was gauged[by whom?] from his attendance at the funeral of U.S. President John F. Kennedy in 1963, representing the Soviet Union and reassuring President Lyndon Johnson that the Soviet Union had nothing to do with the assassination despite the involvement of Lee Harvey Oswald (Oswald had briefly defected to the Soviet Union before his involvement in the assassination of Kennedy).

https://en.wikipedia.org/wiki/Anastas_Mikoyan