It may not be an issue anymore (I don't recall hearing about it in a while, but I'm not sure how long), but it used to be the case that there were two countries that were often regarded as EU troublemakers, and by working together, even though they didn't agree much of the time, they could veto any attempts to undermine each other. I think the other troublemaker was Poland, and I think it may have been before their last election, but that's a lot of unsurity.

Suspension, fwiw, requires unanimity apart from the country in question, so one single dissenter can prevent it.