The attacks are the latest in an escalating cycle of violence between Turkish security forces and Kurdish rebels that has left a 2013 ceasefire agreed by the PKK in tatters.
PKK fighters launched an attack with guns and rockets on a command post in southeastern town of Silopi on the border with Iraq and Syria, prompting clashes that left four militants dead, an army statement said.
The PKK also attacked a military base and police station in the Agri province near the Iranian border, where three of their number were killed in clashes with the security forces, it said.
Speaking to Firat news, pro-Kurdish Peoples' Democracy Party (HDP) lawmaker Dirayet Tasdemir described the incident as a "clear execution."
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Details of the incident could not be independently verified.
Turkey is currently pressing a two-pronged "anti-terror" offensive against Islamic State (IS) jihadists in Syria and PKK militants in northern Iraq and the southeast following a wave of attacks.
But, so far, the air strikes have overwhelmingly concentrated on the separatist Kurdish rebels, who have responded by waging a bloody campaign against the security forces.
President Recep Tayyip Erdogan on Tuesday vowed that Turkey would press on with its relentless campaign against Kurdish militants "until not one terrorist" was left.