Sukhoi Su-27 jet fighters of the Russkiye Vityazi (Russian Knights) aerobatic team perform during the MAKS International Aviation and Space Salon in Zhukovsky outside Moscow, Russia, August 30, 2015.

The presence of planes from both Russia and the U.S.-led coalition in Syrian airspace is “fraught with danger,” the United Nations warned on Monday.

U.N. spokesman Stephane Dujarric was speaking after Turkey protested to Moscow because its F-16 jets intercepted a Russian fighter that violated its airspace near the Syrian border at the weekend.

Two Turkish jets were also harassed by an unidentified MIG-29 on the Syrian border, Turkey’s army said.

“What we are seeing now is a lot of different countries and different coalitions operating in the skies above Syria,” Dujarric said.

“I think it creates a situation that is fraught with danger and very delicate as we had seen on the issue of the violation of airspace with Turkey.”

Dujarric stressed that “this really should refocus people’s attention to finding a political solution” to the brutal Syrian conflict, which has already killed more than 240,000 people and sent millions fleeing in 4.5 years of civil war.

“Whatever actions are taken against Daesh and others should be in conformity with international laws and international humanitarian laws,” Dujarric added, using the Arabic acronym for ISIS.

Russia played down the incursion, saying one of its aircraft had briefly entered Turkish airspace as a result of “unfavorable weather conditions.”

At an emergency meeting, the NATO transatlantic military alliance warned of “extreme danger” of such violations and condemned the incursions.

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