Each and every country would face the same problem, separately and with interesting various plans bbut no negotiation position compared to China or Russia or US. Even Germany or France alone would have serious problems negotiating with these economic powers.
Positive action like promoting internal market, good trade deals, subsidizing and making it easier to run manufacturing again, rebalancing from pure services. Pooling resources. It is what EU all offers much better than any individual country could... even then it it's just not enough.
You cannot outmaneuver 3/4 of the planetary manpower ever without a serious technological gap, and that is closing or already has closed. Even with Russian force and resources they will ultimately fail to dominate. US with their remaining tech lead is already failing...
https://i.imgur.com/PwGHIWH.png
Countries with negative or near-negative per capita growth since 2007 (as of the end of 2018) in nominal terms:
Denmark, Sweden, Netherlands, France, UK, Spain, Italy, Portugal, Austria, Finland, Belgium, Greece
The sole positive result? Germany, a mere 6-7% GDP per capita growth over a decade. In non-inflation adjusted terms, since 2007. Inflation adjusted those other nations have seen that much larger of a contraction.
That's a recipe for disaster in Europe.
How long can most of Western Europe continue to contract economically while social demands increase with aging demographics? It's fundamentally why France is rioting for these past two months, they're being smashed between high taxes, negative growth, and negative quality of life progress.
The UK's GDP per capita has contracted by 20% since 2007 just in nominal terms. Throw a tiny bit of inflation onto that, and you're looking at the UK losing 1/3 of its economy in dollar terms over ~11 years or so. Continue that process for another decade and the result is predictable: people will freak out in increasingly dramatic ways.