On Friday morning, the German Parliament Bundestag voted with a large majority in favour of the two countries joining NATO. The parliamentary groups of the SPD, the Greens, the FDP and the CDU/CSU voted in favour of the northern expansion of the transatlantic alliance. The AfD parliamentary group largely voted in favour, the Left Party against. A few hours later, the Federal Council Bundesrat also gave the green light for Finland and Sweden to join NATO.

The foreign policy spokesman of the Left Party, Dr. Gregor Gysi, said in his speech in the Bundestag debate that the price that Sweden, Finland and the whole of NATO have to pay for Turkey's accession is too high. He said he had initially intended to recommend that his parliamentary group abstain. After the trilateral declaration of intent between Turkey, Finland and Sweden, he refrained from doing so:

"Finland and Sweden will no longer support the YPG. The YPG of the Kurds, however, has led the decisive ground fight against the now truly terrorist Islamic State in Syria and protected the Yazidis from its murderous gangs in Iraq. There are also plans to supply more weapons to Turkey, but the latter is waging wars against the autonomous territories of the Kurds in Syria and Iraq in violation of international law. What does it matter to Turkey that there are autonomous Kurdish areas in Syria and Iraq? Not to forget Turkey's military provocations against NATO member Greece, against Cyprus and, via Azerbaijan, also against Armenia. Erdogan will become even bolder after this success. In addition, more people are now to be extradited to Turkey from Finland and Sweden, but the concept of terrorism is interpreted completely differently in Turkey than in other states. The next coercion is imminent, because Erdogan indirectly threatens not to ratify the accession if the 73 alleged terror suspects from Finland and Sweden are not extradited to Turkey. The price that Sweden, Finland and the whole of NATO will have to pay to Turkey for accession against the Kurds is too high."