Along the highway from Ankara airport to the city centre, municipal workers have been planting flowers and installing giant billboards to shield views of dilapidated homes and poorer neighbourhoods. Ahead of a high-stakes Nato summit that begins on Tuesday, the Turkish capital has had a facelift to burnish its image for the 32 heads of state who will fly in, among them US President Donald Trump. But the makeover and the strict security measures put in place — which will shut down several major roads, forcing shops to close — will make life difficult for residents and business owners in this city of nearly six million people, drawing sharp criticism from locals and opposition politicians.