Elsewhere in Europe. A number of European banks are facing financial pressure this week over concerns about their exposure to Turkey's economic crisis. Spain's BBVA, France's BNP Paribas, and the UK's HSBC are among the banks that have seen the value of their stock dip as a diplomatic row between the US and Turkey intensifies. American sanctions on Turkey have sent the Turkish lira lower - in turn adding to scrutiny of how the European banking system can withstand a worsening of the situation. Olly Barratt reports from London.

The lower the lira goes, the greater the concern about European banks - some of which have stakes in Turkish financial institutions, or may have to write off loans they've made to businesses in Turkey.

On its own that shouldn't necessarily be a huge problem - but it comes at a time when the European banking sector's not in the best health.

MICHAEL HEWSON, CHIEF MARKET ANALYST CMC MARKETS UK "I think in terms of the overall exposure it's manageable, but when you put that in the context of the weakness of the sector in Europe as a whole, it's another thing investors really don't want to have to focus on."

That doesn't necessarily mean that if Turkey's economic woes continue - it will cause a European banking meltdown.

CARSTEN BRZESKI, CHIEF ECONOMIST ING-DIBA "We also have some exposure of Southern European banks to Turkey but this should not be the start of a new banking crisis in the euro zone, or in Europe. There might be some write-downs in a worse case scenario but too little to really kick-start a new economic crisis."

But the geopolitical factor in Turkey's economic issues, provide an extra element of doubt.

OLLY BARRATT LONDON "The old cliche about markets not liking uncertainty is particularly relevant to this story. For investors, it's been difficult to predict the next twists and turns in the diplomatic row between Turkey and the US."

And even if a new eurozone financial crisis isn't on the cards - the European economy could well feel the effects.

MICHAEL HEWSON, CHIEF MARKET ANALYST CMC MARKETS UK "If they are having to set aside further loans in terms of contingency, they're not going to be able to lend to the wider economy, and therefore it means they have less money in terms of funding new business loans."

So the downside to the European economy of Turkey's crisis - are hard for investors to bake into their predictions. OLLY BARRATT, CGTN, LONDON.