Moving forward, I think the ECB and BOJ will be key to long bond yields.
It really has surprised me what the FED has been able to accomplish in the US in the past 15 months. The Fed has demonstrated over the past 15 months that a central bank can raise rates from crazy low levels with little impact on the overall economy; they just need the guts to do it :-). I think back to pre-Sept 2016 and for 8 years straight all everyone was talking about all day was what the Fed was going to do. Today they are way down on the list of topics (and still important).
The ECB and BOJ have to tighten at some point in time so when the next recession comes they have options. They have a window today to do so. IF they do start to shift their stance I think bonds on the long end could spike (with a quick move of 40 or 50 basis points) and this could certainly spook stock markets.
I think the number one risk to the stock market today is a rapid rise in 10 and 30 year bonds. But this will only happen if the ECB and BOJ shift and get much more aggressive with slowing bond purchases and hiking rates; may happen in 2H if global economies continue to show solid growth.
I'm the least of a macro person one can think of, however I'll try to pursue Vikings post here a bit, on a more specific level.
I have several times posted here on CoBF, that with regard to Europe, I think one need to see and understand the shades and nuances of the economic development in Europe/EU. It's not just "a mess" in general. That, however, does not imply that there aren't problems, because there are.
European Commision: Autumn 2017 Economic Forecast.
If you really try to work with that page by clicking around on the map way down on that particular page and read just parts of the data contained in the map [click on the country you need data for] and the documents attached for each country, there is actually a ton of information and data about the reasonable current European economic situation.
Some observations:
1. The Scandinavian countries are doing fairly well.
2. Several of the Eastern European countries actually have strong growth right now.
3. The economic situation has materially changed in Spain and Portugal to the better, compared to a couple of years ago - the pendulum is on its swing on the right trajectory.
4. Even Greece is in growth mode now.
Over the last two years or so, the picture has changed from being "South [in general] is a mess" to that we now have an axis NW-SE orientation through Europe as an indicator of weakness: UK, France & Italy.
No need here to elaborate on UK, I haven't studied the French situation either yet, and then we have Italy: Italy hasen't really fixed its banks yet, so they are [in general] not able to support a ramp up of growth by lending.
I speculate, that's the real problem here for ECB, and I speculate that is the direction ECB is looking nervously - trying not to push Italy back in the hole again. [Like contrary to FED looking at the here on CoBF well covered Detroit economic situation to set interest rates.]