Turkish President Recep Tayyip Erdogan has warned Russia after the latter's combat aircraft violated Turkish airspace for the second time in two months.
Despite several warnings in Russian and English language, a Russian SU-34 jet entered into Turkish airspace on the border with Syria on Friday, reported BBC.
The relationship between the countries has been complex after Turkish F-16s shot down a Russian SU-24 on 24 November as the bomber intruded into Turkish airspace for 17 seconds, CBS News reported.
Erdogan was quoted by reporters as saying: "We regard this infringement, which came despite all our warnings in Russian and in English, as an effort by Russia to escalate the crisis in the region.
"If Russia continues the violations of Turkey's sovereign rights, it will be forced to endure the consequences."
Russia is, however, condemning the allegations, saying that the jet neither crossed over from Syrian territory nor received any warnings.
Nato Secretary General Anders Fogh Rasmussen said: "I call on Russia to act responsibly and to fully respect Nato airspace.
"Russia must take all necessary measures to ensure that such violations do not happen again.
"I welcome the direct contacts between Ankara and Moscow, and I call for calm and de-escalation.
"Nato stands in solidarity with Turkey and supports the territorial integrity of our Ally, Turkey.
"Allies agreed in December to increase the presence of AWACS early warning aircraft over Turkey, as we continue to augment Turkey's air defences.
"This decision precedes yesterday's incident."