US Vice President Joe Biden has spoken to Cypriot President Nicos Anastasiades to brief him on his talks with Turkish leader Recep Tayyip Erdogan, it was revealed on Monday.

In a statement Cypriot government spokesman Nicos Christodoulides said that Biden briefed Anastasiades on his efforts to ease the tension in the eastern Mediterranean in the wake of a Turkish research vessel entering Cyprus’s Exclusive Economic Zone.

According to Christodoulides, Anastasiades thanked Biden for making it clear that “without an end to the Turkey’s illegal actions [reunification] talks cannot resume.”

Biden said he and Erdogan discussed a transition of power in Syria away from President Bashar al-Assad during a four-hour meeting in Istanbul on Saturday.

"On Syria, we discussed ... not only to deny ISIL a safe haven and roll back and defeat them, but also strengthen the Syrian opposition and ensure a transition away from the Assad regime,» Biden told a joint news conference with Erdogan.