The less good news is that Law and Justice can govern without the need for coalition partners—for the first time in post-Communist Poland. This means that Poland’s new government will not be dogged by the instability that forced it prematurely out of office in 2007.

That stability could allow Beata Szydło, Poland’s new prime minister designate, to fundamentally shift Poland’s foreign and security policy from the outward-looking and ambitious one that the center-right Civic Platform had pursued to a more inward-looking one more focused on the immediate region. This will affect Warsaw’s relations with the EU and NATO.

Supporters of Law and Justice are conservative, nationalist, and Euroskeptic. They resent what they see as diktats issued by Brussels and they will certainly oppose EU plans to accept more refugees that are arriving in Europe. Kaczyński has already said that refugees and migrants coming to Europe caused “epidemics.”

Yet Law and Justice has to admit that Poland has done very well out of the EU. Civic Platform had put energy security as well as an energy union—two big priorities for Warsaw—high on the EU’s agenda. Poland has had repeated run-ins with Brussels over carbon emission levels and the subsidies that Warsaw provides to the Polish coal industry. In short, Civic Platform cannot be accused of kowtowing to Brussels.

It’s the Euroskepticism of Law and Justice that is bad news for the EU. Another Euroskeptic government has the potential to further weaken the union’s ability to project a united, liberal voice.

This can only be good news for Russian President Vladimir Putin, who can look with satisfaction at the rise of Euroskeptic parties that challenge what the EU stands for. A strong and coherent Europe is not in Putin’s interests.

However, it would be surprising if Law and Justice wavered over the EU sanctions on Russia. Apart from being Euroskeptic, Kaczyński is also very anti-Russian, unlike his Hungarian counterpart and the Czech president. He has never stopped believing that his twin brother and former Polish president, Lech, was assassinated (by Russia) when his presidential plane crashed in Smolensk, western Russia, in April 2010.

Furthermore, Law and Justice was critical of how Civic Platform had begun a dialogue with Russia aimed at working toward a reconciliation with one of Poland’s archenemies. That dialogue suffered after Russia’s annexation of Crimea in March 2014, but those diplomats and experts who started this immensely difficult task managed to continue it against all the odds. There is little doubt that this dialogue could be a casualty of Law and Justice’s foreign policy.

Another casualty could be Poland’s relationship with its neighbor Germany. The political, trade, and social ties had blossomed under Civic Platform. Kaczyński, however, has never hidden his dislike of Germany. His supporters told Carnegie Europe that Civic Platform was too beholden to Berlin, that Poland did everything that German Chancellor Angela Merkel told them to do.

And when Germany opposed NATO establishing a permanent base in Poland because Berlin didn’t want to provoke Russia (regardless of what Russia has been doing in Ukraine), Law and Justice blasted that decision.

It’s a decision that Law and Justice is sure to bring up in NATO and make into an issue when Warsaw hosts the next NATO summit in 2016—if it is not resolved before then. One thing is certain: it will be hard to see Szydło, with Kaczyński in the background, taking no for an answer from NATO as this duo steers Poland to a not entirely predictable future.