Turkey crossed red line when it started testing S-400 radar: US senator

Turkey has crossed ‘another red line’ by starting
tests of the radar detection system it purchased from Russia as part of the
S-400 missile defense system, US Senator for Maryland Christopher Van Hollen
said.
"Two weeks after his White House visit, Turkish
President Recep Tayyip Erdogan is thumbing his nose at Trump, the U.S. + NATO,
and crossing another red line on S-400s," Van Hollen said in a Twitter
post, Russian news agency TASS reported on Tuesday.
"Existing law requires Trump to impose
sanctions. Pompeo must also confront Turkey about its latest ‘safe zone’
violations and attacks against the Kurds," the US senator added.
The Pentagon refused to comment on whether the US
personnel was taking part in Turkey’s trials of S-400 systems, which it had
earlier began with the use of US-made F-16 fighter jets.