BRUSSELS, May 30 (Reuters Breakingviews) - In the euro zone bond market, unlimited backstops are the cheapest. The European Central Bank has been trumpeting its ability to buy member states’ debt if it comes under attack from investors. The danger here is that too much divergence would lead the euro zone to fracture, creating a powder keg for crisis. The central bank has been deliberately quiet about exactly when and how it might activate the crisis tool, except to say it will be ready if necessary. They have noted that the euro zone central bank has a new instrument to combat any sharp increase in the differential between yields of euro zone government bonds.

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Persons: Christine Lagarde, –, Lagarde, Fabio Panetta, hasn’t, there’s, Nils Redeker, Berlin’s Jacques Delors, Philip Lane, Francesco Guerrera, Oliver Taslic Organizations: Reuters, European Central Bank, ECB, Italy, Reuters Graphics Reuters, ECB won’t, Reuters Graphics, U.S . Federal, Silicon Valley Bank, Signature Bank, ”, European Union, Twitter, Thomson Locations: BRUSSELS, Frankfurt, Italy, Spain, Greece, Lithuania, Silicon, EU, Ukraine