The American RC-135 was conducting routine operations May 30 when a Russian SU-27 Flanker flew up from behind, passed underneath then crossed over to the American plane's right-hand side, spokesman Colonel Steve Warren said.
"We don't know exactly why this intercept was conducted unprofessionally," he told reporters.
"It may have been a lack of training on the part of the Russian pilot. It may have been just a general level of unprofessionalism of the individual who was flying the Flanker."
The US plane was intercepted a second time on the same flight, but that was deemed to have been done appropriately, Warren said.
Russian and US planes routinely monitor each other's movements in international airspace, but this encounter is the latest in a series of incidents sparking concerns over how Russia carries out airborne intercepts.
On April 7, a Russian Flanker jet performed "aggressive manuevers" in close proximity to a US reconnaissance plane in an incident that occurred over the Baltic Sea, in international airspace north of Poland.
NATO jets have in recent months been scrambled to intercept Russian planes approaching Baltic countries' airspace, amid tensions over the crisis in Ukraine.
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