The United States will send two warships to the Black Sea next week amid a Russian build up of military forces along its border with Ukraine, the Turkish government said Friday.

NATO ally Turkey said the two U.S. warships would reach the Black Sea from Wednesday to Thursday after Washington notified Ankara of the move a little over two weeks ago.

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“A notice was sent to us 15 days ago via diplomatic channels that two U.S. warships would pass to the Black Sea, in line with the Montreux Convention,” a 1936 treaty which gave Ankara control of the seas’ straits, according to Turkey’s foreign ministry, as reported by Reuters. “The ships will remain in the Black Sea until May 4.”

Read more at The Hill.