Petro Poroshenko, Ukraine’s former president, said Saturday that he was prohibited from leaving the country, accusing the government of violating a so-called political cease-fire in place since Russia’s invasion.

Poroshenko, who was president from 2014 to 2019, has made numerous public appearances since the war began, including commentary on foreign television.

After President Volodymyr Zelensky’s ruling party, his European Solidarity party is the second largest in Ukraine’s parliament.

Following Russia’s invasion, Ukraine’s parliament banned many pro-Russian parties while allowing others to continue operating under a so-called political cease-fire — a tacit agreement that all parties would set aside domestic political differences in order to unify against the conflict.

But on Saturday, Poroshenko’s office said he “was refused to cross the border of Ukraine,” accusing the government of violating the agreement.

“There is a risk that by this decision, the authorities have broken the ‘political cease-fire’ in place during the war… which one of the pillars of national unity in the face of Russian aggression,” his office said.

Poroshenko had acquired official clearance to travel to a NATO parliamentary assembly meeting in Lithuania as part of the Ukrainian delegation.

He was scheduled to meet with Lithuanian President Gitanas Nauseda and a delegation of European parliamentarians in Vilnius.

He was then scheduled to fly to Rotterdam, Netherlands, for a conference of European political parties.

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