Update (July 8): This week, Russian president Vladimir Putin approved a package of anti-terrorism laws that usher in tighter restrictions on missionary activity and evangelism.

Despite prayers and protests from religious leaders and human rights advocates, the Kremlin announced Putin’s approval yesterday. The amendments, including laws against sharing faith in homes, online, or anywhere but recognized church buildings, go into effect July 20.

Though opponents to the new measures hope to eventually appeal in court or elect legislators to amend them, they have begun to prepare their communities for life under the new rules, reported Forum 18 News Service, a Christian outlet reporting on the region.

Protestants and religious minorities small enough to gather in homes fear they will be most affected. Last month, “the local police officer came to a home where a group of Pentecostals meet each Sunday," Konstantin Bendas, deputy bishop of the Pentecostal Union, told Forum 18. "With a contented expression he told them: ‘Now they're adopting the law I'll drive you all out of here.’ I reckon we should now fear such zealous enforcement.”

“There are potentially very wide-sweeping ramifications to this law,” Joel Griffith of the Slavic Gospel Association said in a Mission Network News report. “It just depends on, again, how it is going to be enforced, and that is a very huge question mark.”

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Earlier reporting (June 29): Christians in Russia won’t be allowed to email their friends an invitation to church or to evangelize in their own homes if Russia’s newest set of surveillance and anti-terrorism laws are enacted.

The proposed laws, considered the country’s most restrictive measures in post-Soviet history, place broad limitations on missionary work, including preaching, teaching, and engaging in any activity designed to recruit people into a religious group.

To share their faith, citizens must secure a government permit through a registered religious organization, and they cannot evangelize anywhere besides churches and other religious sites. The restrictions even apply to activity in private residences and online.

This week, Russia’s Protestant minority—estimated around 1 percent of the population—prayed, fasted, and sent petitions to President Vladimir Putin, who will have to approve the measures before they become official.

“Most evangelicals—leaders from all seven denominations—have expressed concerns,” Sergey Rakhuba, president of Mission Eurasia and a former Moscow church-planter, told CT. “They’re calling on the global Christian community to pray that Putin can intervene and God can miraculously work in this process.”

Following a wave of Russian nationalist propaganda, the laws passed almost unanimously in the Duma, the upper house, on Friday and in the Federation Council, the lower house, today.

“If this legislation is approved, the religious situation in the country will grow considerably more complicated and many believers will find themselves in exile and subjected to reprisals because of our faith,” wrote Oleg Goncharov, spokesman for the Seventh-day Adventists’ Euro-Asia division, in an open letter.

Proposed by United Russia party lawmaker Irina Yarovaya, the law appears to target religious groups outside the Russian Orthodox church. Because it defines missionary activities as religious practices to spread a faith beyond its members, “if that is interpreted as the Moscow Patriarchate is likely to, it will mean the Orthodox Church can go after ethnic Russians but that no other church will be allowed to,” according to Frank Goble, an expert on religious and ethnic issues in the region.

Russian nationalist identity remains tied up with the Russian Orthodox church.

“The Russian Orthodox church is part of a bulwark of Russian nationalism stirred up by Vladimir Putin,” David Aikman, history professor and foreign affairs expert, told CT. “Everything that undermines that action is a real threat, whether that’s evangelical Protestant missionaries or anything else.”

Sergei Ryakhovsky, head of the Protestant Churches of Russia, and several other evangelical leaders called the law a violation of religious freedom and personal conscience in a letter to Putin posted on the Russian site Portal-Credo. The letter reads, in part:

The obligation on every believer to have a special permit to spread his or her beliefs, as well as hand out religious literature and material outside of places of worship and used structures is not only absurd and offensive, but also creates the basis for mass persecution of believers for violating these provisions.

Soviet history shows us how many people of different faiths have been persecuted for spreading the Word of God. This law brings us back to a shameful past."

Stalin-era religious restrictions—including outlawing religious activity outside of Sunday services in registered churches and banning parents from teaching faith to their kids—remained on the books until the collapse of the Soviet Union, though the government enforced them only selectively.

Some have questioned whether the government could or would monitor religious activity in private Christian homes.

“I don’t think you can overestimate the Russian government’s willingess to exert control,” Aikman told CT. If history is any indication, the proposed regulations reveal a pattern of “creeping totalitarianism” in the country, he said.

The so-called Big Brother laws also introduce widespread surveillance of online activity, including requiring encrypted apps to give the government the power to decode them, and assigning stronger punishments for extremism and terrorism.

The proposal is an “attack on freedom of expression, freedom of conscience, and the right to privacy that gives law enforcement unreasonably broad powers,” the humanitarian group Human Rights Watch toldThe Guardian.

If passed, the anti-evangelism law carries fines up to US $780 for an individual and $15,500 for an organization. Foreign visitors who violate the law face deportation.

Russia has already moved to contain foreign missionaries. The “foreign agent” law, adopted in 2012, requires groups from abroad to file detailed paperwork and be subject to government audits and raids. Since then, the NGO sector has shrunk by a third, according to government statistics.

“In Moscow, we shared an office with 24 organizations. Not a single foreign expatriate mission is there now,” Rakhuba previously told CT. “They could not re-register. Missionaries could not return to Russia because they could not renew their visas. It is next to impossible to get registration as a foreign organization today.”

While Russia’s evangelicals pray that the proposed regulations are amended or vetoed, they have gone underground before, and they’ll be willing to do it again, Rakhuba said.

“They say, ‘If it will come to it, it’s not going to stop us from worshiping and sharing our faith,’” he wrote. “The Great Commission isn’t just for a time of freedom.”