EU leaders are expected to hail a breakthrough in efforts to strengthen integration in the eurozone.
However, decisions at the EU summit in Brussels to set out a range of checks and balances on eurozone banks also raise new questions about a two tier Europe.
British banks will not to subject to the new centralised scrutiny, continuing to be supervised by national authorities.
Most of the other nine non-eurozone states are considering whether to submit their banks to the new economic crackdown.
Only the UK and Denmark are able to formally opt out of joining the euro.
More top news
Three men gored and 10 others hospitalised during first day of a week-long San Fermin festival in the northern Spanish city of Pamplona.
People travelling into the capital have been getting off a stop early to walk together in remembrance of the victims of the 7/7 bombings.
Olympian Dawn Fraser has been accused of racism after saying tennis player Nick Kyrgios should "go back" to where his parents came from.