WASHINGTON, Nov 25: President Barack Obama and Turkish President Tayyip Erdogan spoke by phone about the need to de-escalate tensions with Russia after Turkey shot down a Russian warplane near the Turkish-Syrian border, the White House said. Obama expressed “US and NATO support for Turkey’s right to defend its sovereignty,” the White House said yesterday in a statement. “The leaders agreed on the importance of de-escalating the situation and pursuing arrangements to ensure that such incidents do not happen again,” the statement said. (AGENCIES)