In this Oct. 22, 2015 file photo, a Russian Su-24 takes off on a combat mission at Hemeimeem airbase in Syria. Turkey said Saturday Jan. 30, 2016 that a Russian warplane SU-34 has again violated its airspace despite several warnings.
NATO head Jens Stoltenberg on Saturday warned Russia it must "fully respect" alliance airspace as key member Turkey blasted Moscow for "irresponsible behaviour" over a new violation.
"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," Stoltenberg said in a statement.
In November, Turkey shot down a Russian warplane on the Syrian border, sparking a war of words with Russia which insisted its plane had not violated Turkish airspace.