Georgia's former president, who later served as governor of Ukraine's Odessa region, has pledged to unite the opposition against his former ally and job-giver Ukrainian President Petro Poroshenko.
The hypocrisy of everyone who says they want to bring a brighter future to this country but violate the basis of its very existence - the rule of law.
The comments came a day after Saakashvili forced his way past border guards into his adopted homeland with hundreds supporters in protest against the withdrawal of his Ukrainian citizenship by the government.
"A forceful breakthrough of the Ukrainian border is a crime and those who were involved in the organization of this breakthrough should be held responsible", Ukrainian Prime Minister Volodymyr Groysman wrote on Facebook today.
Saakashvili divides opinion. Supporters see him as a fearless crusader against corruption but critics say there is little substance behind his blustery rhetoric. It was revoked in July by the Ukrainian president, reportedly on the grounds that Saakashvili failed to mention there was a criminal case against him in Georgia.
That move left the charismatic pro-Western politician stateless as he had earlier been stripped of his citizenship in his homeland Georgia.
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Once in Ukraine, he could possibly be arrested and deported to Georgia to face charges, the BBC's Europe Regional Editor, Danny Aeberhard, said. He forfeited his Georgian citizenship when he accepted Poroshenko's welcome to Ukraine and the post as Odessa governor two years ago.
Saakashvili denies the accusations branding them a political witch hunt.
Mikheil Saakashvili and a small crowd of supporters shoved their way through a line of guards at the Ukrainian border Sunday, making good on the politician's vow to return to the land that had stripped him of citizenship.
The failure to stop Mr Saakashvili from returning was an embarrassment for Kiev and another headache for a leader fighting a Russian-backed insurgency and trying to restart a struggling economy.
Prosecutor-General Yury Lutsenko said late on September 10 that charges would be pursued against the people who helped organize Saakashvili's entry. He also announced the establishment of an anti-corruption, anti-elitist political party, "citing past praise by U.S. President-elect Donald Trump for his reforms". This was savage: the crowd of people running to the border line, clashing with border guards, Saakashvili pushing his way through the line of soldiers and falling into arms of a cheerful crowd.
Saakashvili, a disgraced politician, boarded an Intercity train in Poland to travel to Ukraine's Lvov, but the train was delayed "because of a passenger without a right to enter the territory of Ukraine".