Turkey has called for an extraordinary meeting of NATO to discuss the escalating violence caused by the crisis in Syria.
The meeting, which will be held in Brussels on Tuesday, was invoked under Article 4 of the NATO treaty.
This allows any of the organisation's 28 members to request assistance when they consider "their territorial integrity, political independence or security is threatened."
A statement from NATO Secretary General Jens Stoltenberg said: "Turkey requested the meeting in view of the seriousness of the situation after the heinous terrorist attacks in recent days, and also to inform Allies of the measures it is taking.
"NATO Allies follow developments very closely and stand in solidarity with Turkey."
The move comes as Turkey continued its airstrikes against Islamic State extremists in Syria and widened its anti-terror campaign to hit Kurdish militant targets inside Iraq.
Sky News Foreign Affairs Editor Sam Kiley said: "They are asking for surveillance aircraft to help with problems along the border.
"It is part of its argument for safe zones inside Syria along its border that would be policed by armed forces presumably from NATO and members of the US-led coalition."
He added: "The other concern for NATO partners would be that this has been a period in which Kurdish separatist groups have been targeted by Turkish airstrikes and these very same armed groups are working hand in glove with the US-led coalition on the ground in Syria.
"That is going to cause friction."
Article 4 has been invoked numerous times such as by Turkey in 2003 and 2012 and by Poland in 2014.
The US has backed Turkey's action against attacks by the rebel Kurdistan Workers Party or PKK, saying it "has a right to defend itself."
The PKK, which has been fighting Turkey for autonomy since 1984 and is also considered a terrorist organisation by Ankara.
The escalation in military activity by Turkey comes after a suspected IS suicide bomber killed 32 people, some of them Kurds, in the border town of Suruc.
This triggered violence in the mainly Kurdish southeast, with the PKK killing two police officers, claiming it was retaliation for the suicide attack.
