The Ukrainian president mocked Russia's offer to give passports to his compatriots, saying that the document would grant "the right to arrest".
In a Facebook post which refused the idea, Volodymyr Zelensky pledged to grant "the citizenship" "Russians are suffering".
Earlier this week, Russian President Vladimir Putin signed a decree offering people passports in the separatist territories of eastern Ukraine.
Later he said he wanted to extend the system to all Ukrainians.
But Mr. Zelensky ̵
"Ukrainians are free people in a free country," he said.
He offered citizenship to "all people who suffer from authoritarian and corrupt regimes" but above all "to the Russian people, who suffers most of all".
The Facebook post was written in both Ukrainian and Russian You can hear us, "said Mr. Zelensky.
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Relations between The two countries were further tense this week as the Ukrainian parliament passed a law that mandated the application of the law the Ukrainian language is mandatory for public sector workers.
Russia says the move discriminated against Russian-speaking people in Ukraine – for many, especially in the eastern regions, Russian is still the mother tongue.
The new tensions contribute to the challenges faced by Mr. Zelensky, who displaced Petro Poroshenko by a landslide.
What did Putin say?
On Wednesday, the Russian leader announced that the passport regime would be approached in Donetsk and Luhansk ndt, the self-proclaimed republics seized by Russian-backed separatists in 2014 after Russia annexed Crimea from Ukraine.
The Crimea itself was integrated into Russia, giving citizens the same citizenship rights as in Russia.
Those living in Donetsk and Luhansk who considered themselves Russian were entitled to Russian passports.
On Saturday he said: "We are considering providing all residents of Ukraine with a simplified procedure [of obtaining Russian citizenship]."
How to answer Ukraine?
Mr. Zelensky said that a Russian passport offers "the right to be arrested for a peaceful protest" and "the right not to have free and competitive elections".
He also called for "complete decommissioning" of eastern Ukraine and the Crimea stresses that his country "does not give up."
Ukrainian politicians accuse Russia of making its territorial divisions permanent.
But Mr. Zelensky also proposed a conciliatory tone and said he was ready for negotiations on the armed conflict, which has claimed about 13,000 lives since 2014.
"I hope that Russia speaks rather than shoots". He wrote.
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In the run-up to his election, he said he wanted to "renew relations with eastern Ukraine and begin a powerful information war to end the conflict."
In response, Russia said it should show "solid judgment," "honesty," and "pragmatism" to improve relations.
What is the new language law?
Under the new law:
- Ukrainian has to be used for signs, letters and advertisements.
- Local TV channels are set to 90% Ukrainian content.
- Ukrainian should be used for all public duties of public servants from the president to judges, doctors and bank employees
Mr. Zelensky, whose native language is Russian, defended the new legislation advocated by Mr. Poroshenko.
However, he added that he intends to review it once he has taken office.