https://www.marketwatch.com/investing/bond/TMBMKIT-10Y?countrycode=BX
With government debt of 2.4 trillion € a jump of 0.25% results in more interest payments of 6 billion € per year.
I think this jump in interest rates is just the beginning. It's time that the market participants price in the political and economic risks in Italy (and the Eurozone in general). This process will be self-reinforcing: higher interest --> more debt --> more risk --> higher interest rates ... then spillover effects to other Eurozone countries... money will continue to flow out of Europe. (into the US dollar, US stocks, gold, crypto)... government bankrupcies... higher unemployment ... more civil unrest (gilets jaunes) ...
I hope I am wrong (but I don't believe in the concept of hope).