BRUSSELS — Europe’s effort to face as much as Russia and Vladimir V. Putin, its president, is being slowed by two strongmen leaders insisting on the precedence of their nationwide pursuits and taking part in to home audiences.

President Recep Tayyip Erdogan of Turkey on Wednesday blocked a procedural vote on NATO moving ahead quickly with the membership applications of Sweden and Finland, handed in with a lot publicity Wednesday morning, a senior European diplomat mentioned.

And Prime Minister Viktor Orban of Hungary continues to dam even a watered-down European Union effort to place an embargo on Russian oil, a part of a sixth bundle of sanctions aimed toward Moscow for its struggle towards Ukraine.

Whereas NATO and the European Union have proven exceptional unity of their response to Mr. Putin’s struggle, the actions of the 2 authoritarian leaders present the strains building as the war drags on, peace talks seem to go nowhere, and Western sanctions are contributing to financial ache and excessive inflation at dwelling, in addition to in Russia.

Mr. Erdogan and Mr. Orban could also be outliers of their organizations, however they can use the requirement for consensus in each NATO and the European Union to get their political considerations addressed by blocking the motion of all of the others, even quickly.

On Wednesday, a gathering of NATO ambassadors couldn’t attain consensus on a primary vote to proceed with the requests for membership as a result of Turkey mentioned it first wished NATO to deal with its safety considerations. Particularly, Ankara needs Finland and particularly Sweden to finish what Mr. Erdogan has known as help for “terrorist organizations” of their nations, primarily the Kurdistan Staff’ Social gathering, or PKK, in addition to to elevate export bans on sure arms gross sales to Turkey.

Turkey’s choice to dam consensus got here hours earlier than the Turkish overseas minister, Mevlut Cavusoglu, was set to fulfill with Secretary of State Antony J. Blinken in New York; Turkey needs its safety considerations to be addressed earlier than NATO’s annual summit assembly in late June.

In an handle to his lawmakers in Parliament on Wednesday, Mr. Erdogan criticized at size Western help for Kurdish teams that Ankara sees as a terrorist risk.

“It wouldn’t be mistaken to say that we’re bittersweet watching the solidarity and cooperation within the area, the sources used, the arms opened, the tolerance proven,” he mentioned. “As a result of we, as a NATO ally who struggled with terror for years, whose borders have been harassed, huge conflicts occurred simply subsequent door, have by no means seen such an image.”

Turkey “requested for 30 terrorists,” he mentioned. “They mentioned: ‘We’re not giving them,’” Mr. Erdogan instructed the Parliament. “You received’t hand over terrorists however you wish to be a part of NATO. We can’t say sure to a safety group that’s devoid of safety.”

The PKK is a Kurdish guerrilla group that has fought a decades-long separatist insurgency in components of Turkey. It was designated by the US as a terrorist group in 1997.

Mr. Erdogan stays indignant over help from Washington and Stockholm for a PKK-affiliated militia in Syria, the place the group was preventing the Islamic State. His authorities final yr rebuked the United States and Sweden over the matter. And Turkey has demanded the extradition of six alleged PKK members from Finland and 11 alleged PKK members from Sweden.

Mr. Erdogan has mentioned these points trigger him to not have “favorable ideas” in regards to the membership of the Nordic nations. However he has not mentioned that he would veto their functions.

On Saturday, Ibrahim Kalin, Mr. Erdogan’s spokesman and foreign-policy adviser, mentioned: “We’re not closing the door. However we’re mainly elevating this situation as a matter of nationwide safety for Turkey.”

Nationwide safety is Mr. Orban’s argument, too. Hungary depends on Russia for its vitality, getting 85 % of its pure gasoline and 65 % of its oil provide from Russia, in addition to utilizing Russian know-how for its nuclear energy crops.

Whereas Hungary has authorised all earlier sanction packages, together with an embargo on Russian coal, Mr. Orban proclaimed that an oil embargo could be the equal of an “atomic bomb” for the Hungarian economic system.

However like Mr. Erdogan in NATO, Mr. Orban this time is the only holdout, in his case, within the weekslong E.U. efforts to finalize a gradual embargo on Russian oil, the headline measure in a sixth bundle of sanctions for the reason that invasion of Ukraine.

Talks started in mid-April. After in depth session between E.U. officers and diplomats from the bloc’s 27 member states, a proposal was placed on the desk incorporating completely different positions in early Could.

However Hungary appeared to be transferring the objective posts. The primary proposal gave extensions to Hungary and Slovakia so they may discover different suppliers. Whereas the opposite 25 E.U. members would have till the tip of the yr, Hungary and Slovakia would have till the tip of 2023.

Then Hungary demanded, and secured, much more time. The most recent model of the bundle would grant it till the tip of 2024, however Mr. Orban has insisted that Hungary would wish billions from the bloc to defend his nation’s economic system. His overseas minister, Peter Szijjarto, mentioned that to make use of completely different oil and modernize Hungary’s vitality system would price between 15 billion and 18 billion euros and take 5 years.

Hungary’s block on an E.U. oil embargo, breaking unprecedented unity in punishing Russia, was well-received in Moscow. Dmitri Medvedev, Russia’s former president who at the moment serves as deputy chairman of the nation’s nationwide safety council, mentioned Mr. Orban’s opposition to the oil embargo was “a brave step for unvoiced Europe.”

In a submit on his Telegram channel on Could 6, Mr. Medvedev wrote: “Apparently, probably the most wise leaders of the E.U. nations are uninterested in transferring quietly to the precipice together with all the sterilized European herd being led to the slaughter by an American shepherd.”

Diplomats mentioned that they anticipated Mr. Orban ultimately to acquiesce to an oil embargo, having secured each a protracted extension and further funding for Hungary, however that he may drag the talks out even longer, maybe till the tip of the month when leaders are on account of meet in individual in Brussels to speak about Ukraine.

NATO officers expressed the identical confidence about Mr. Erdogan — that he’ll ultimately comply with again Sweden and Finland becoming a member of NATO in return for some concessions that may assist him politically at dwelling, along with his economic system in disaster and new elections solely a yr away.

Alexander Stubb, a former Finnish prime minister and overseas minister, mentioned that “the Finns are cool and picked up and so are the Swedes — this can work out.”

Ultimately, he mentioned, “that is about safety in Europe and about strengthening the alliance, and each Finland and Sweden are robust advocates of Turkish membership within the European Union.”

In 1999, he mentioned, it was the Finnish presidency of the European Union that opened the door for Turkish accession, “and our associates in Ankara will do not forget that.”

Sauli Niinisto, the president of Finland, mentioned in Stockholm that the Turks “have communicated to us from many sources that Turkey wouldn’t block membership.” A quick course of continues to be attainable, he mentioned.

Jens Stoltenberg, the NATO secretary-general, mentioned on Sunday, “Turkey has made it clear: Their intention is to not block membership. Subsequently, I’m assured we’ll be capable of handle the considerations that Turkey has expressed in a approach that doesn’t delay the accession course of.”

No less than not an excessive amount of.

Reporting was contributed by Carlotta Gall in Kharkiv, Ukraine; Benjamin Novak in Budapest; and Johanna Lemola in Helsinki.