President Donald Trump said Tuesday that US relations with Turkey are good despite Ankara's decision to buy a Russian missile defense system, making no mention of sanctions Washington has threatened over the purchase. Trump said Turkey was forced to buy the S-400 system by his predecessor Barack Obama, leading the Pentagon to halt plans to sell F-35 fighter jets to the country. "I've had a good relationship with President (Recep Tayyip) Erdogan," Trump told journalists. "It's a very tough situation that they're in and it's a very tough situation that we've been placed in. With all of that being said, we're working through it - we'll see what happens."