Istanbul - Two journalists were arrested in Turkey on Sunday, their media outlets said, the latest in a wave of detentions ahead of a NATO summit in Ankara next week due to be attended by leaders including U.S. President Donald Trump.Major roads through the Turkish capital were closed and police stationed in side streets as authorities began throwing a security blanket over the city in anticipation of the July 7-8 summit.Trump is on good terms with Turkey’s veteran President Recep Tayyip Erdogan, and NATO members are hoping to court him in Ankara as concerns linger about Washington’s commitment to the alliance, underscored by fears Russia could launch new attacks in Europe in coming years.