According to the Pentagon, four Russian aircraft flew in an "unsafe and unprofessional" manner near a U.S. Navy destroyer in the Black Sea. A defense official told NBC News that a Russian Su-24 flew within 200 yards of the USS Porter last week. The jet was armed and flew at an altitude of just 300 feet and a speed in excess of 500 knots.In a separate incident, two other unarmed Russian Su-24s came within 300 yards of the ship. In addition, an IL-38 flew at unusually low altitude.According to two defense officials the Navy tried to contact the Russian aircraft by radio. There was no response. No evasive action was taken by the U.S. vessel.
The US military has released several photos of what it says were Russian fighter jets "buzzing" the deck of a US warship in the Black Sea last week.
The images of SU-24 fighter jets off the bow of the American guided missile destroyer USS Porter emerged as the commander of the US military arrived in Baku, Azerbaijan, to meet with his Russian counterpart.
Earlier this week, a Russian ministry of defense spokesman denied reports that Russian jets conducted "fly-bys" past the USS Porter on February 10.
The photos of Russian jets roaring close to the deck of the American warship appear to contradict Moscow's denial.
Two Russian Su-24 jets pass close to the USS Porter in the Black Sea last week.
"The ship captain labeled these events as unsafe and unprofessional because of the potential for an accident," said Lt. Col. David Faggard, spokesman for the US military's European Command.Faggard said at least four Russian warplanes conducted fly-bys at unusually low altitudes and at a high rate of speed on February 10.
He said the guided missile destroyer was sailing in international waters after having completed joint military exercises with NATO ally Romania.
Another view of one of the two Russian Su-24 jets that "buzzed" the USS Porter.
First an IL-38 propeller-engine maritime patrolling plane flew past the vessel. It was later followed by three Su-24 fighter jets.
This isn't the first time Russian fighter jets have been filmed operating in close proximity to American warships and warplanes. Similar incidents have taken place in the skies above Syria -- where both air forces regularly conduct bombing operations -- and in the Baltic Sea.
According to an official from the NATO military alliance, there has been a surge of NATO aircraft that have "scrambled" to intercept Russian warplanes approaching NATO airspace.
"Allied aircraft scrambled around 400 times to meet Russian aircraft over Europe in both 2014 and 2015. In 2016, allied aircraft scrambled around 800 times in response to Russian aircraft," the NATO official wrote in a statement to CNN.
Part of the increase is due to Russia's ongoing military operations in Syria, which borders NATO member state Turkey.
In November 2015, the Turkish military shot down a Russian warplane that was bombing targets along the Syrian-Turkish border. A Russian pilot was killed in the incident.
The Russian military also periodically announces incidents when Russian warplanes intercept US and NATO aircraft approaching Russian airspace.
On Thursday, Chairman of the Joint Chiefs of Staff Gen. Joe Dunford is scheduled to meet with Chief of the Russian General Staff Gen. Valeriy Gerasimov in the capital of Azerbaijan.