Baldanza said the Russian jet's movements were deemed unsafe because it forced the Navy plane to enter its jet wash, which caused it to experience "a 15-degree roll and violent turbulence".
Russia's military responded Tuesday by saying its jet had been dispatched because the US plane was approaching its borders "at high speed", according to the state-run TASS news agency.
The incident occurred last Saturday, when Russian radio-surveillance media identified a SU-30 to prevent violation of its borders, explained the same source.
Russian Federation has scrambled a Su-30 fighter jet after detecting an American Р8А Poseidon reconnaissance aircraft over the Black Sea, according to a Defense Ministry statement.
Traffic above the shared waters in Europe's southeast has resulted in a handful of tense encounters since relations with Moscow deteriorated in 2014 and the near miss between the Russian and US jets was among the more spectacular.
GETTY UNSAFE The Russian jet flew within five feet of the US aircraft
Russian and U.S. aircraft regularly come into contact in global airspace.
"This interaction was determined to be unsafe", Henderson said in the emailed statement.
The Navy aircraft had its transponder on and was conducting "routine operations in worldwide airspace".