Istanbul: The grip of bears on Turkish assets tightened as the nation’s souring relationship with the US added to investor concern over authorities’ inability to put a lid on inflation, sending its currency to a fresh record low and driving up bond yields.

The lira plunged more than 3 per cent to 5.4385 per dollar, taking this year’s losses to almost 30 per cent, after a US official who spoke on condition of anonymity said a Turkish delegation refused to commit to releasing an American pastor. That raises the prospect of an escalation in the diplomatic row between the Nato allies, which has already taken a toll on Turkey’s assets.

The development “raises the odds that the US will double down on their sanctions” and adds to the “domestic challenges that plague lira-denominated assets,” analysts including Michael Every at Rabobank in London wrote in note to clients.

The yield on 10-year Turkish bonds jumped 60 basis points to 19.67 per cent while one-month lira-dollar risk reversals, the premium traders pay for options to sell the local currency over those to buy, climbed above 5 percentage points this week for the first time since 2011.

Speculation had been building that a Turkish delegation that met with US Deputy Secretary John Sullivan on Wednesday would seek a way out of the standoff after the US sanctioned two government ministers over the continued detention of Andrew Brunson last week.

The lira has weakened about 8 per cent since US measures were announced, and some investors are concerned that more sanctions are likely unless the pastor is released. That’s piling pressure on the central bank to raise rates and prevent a further acceleration in runaway prices, potentially at an unscheduled meeting. The central bank is next scheduled to meet on September 13.