The prime ministers, who arrived by train, sat round a table with their Ukrainian counterpart Denis Shmyhal and the Ukrainian President, who detailed the situation to them.

“They are shelling everywhere. Not only Kyiv but also the western areas,” Zelensky told the prime ministers

“We have to halt this tragedy unfolding in the East as quickly as possible,” Polish Prime Minister Mateusz Morawiecki said in a post on Facebook announcing their arrival

Ukraine had the “unequivocal support” of the European Union, he added.

Shmyhal earlier confirmed their arrival in a post on Twitter, saluting the courage of true friends of Ukraine.

He said their talks would focus on support for Ukraine and “strengthening sanctions against the Russian aggression”.

Morawiecki, Czech premier Petr Fiala and Slovenia’s Prime Minister Janez Jansa, were visiting as “representatives of the European Union,” as said in an early statement from the Polish government.

The visit came as Russia’s pummels were targeted across Ukraine including Kyiv, which had nearly been encircled by Moscow’s troops, and as Russia and Ukraine were due to resume talks to end the nearly three-week war.

“In such crucial times for the world, it is our duty to be in the place where history is being made,” Morawiecki said in a Facebook post, earlier on Tuesday.

“Because this is not about us, it is about the future of our children who deserve to live in a world free from tyranny,” he said.

The government statement said that the visit had been organised “in agreement” with European Council chief Charles Michel and European Commission President, Ursula von der Leyen.

“The purpose of the visit is to confirm the unequivocal support of the entire European Union for the sovereignty and independence of Ukraine and to present a broad package of support for the Ukrainian state and society,” the statement said.

The trio was accompanied by Jaroslaw Kaczynski, leader of Poland’s populist right-wing Law and Justice party.

Prosecutors said that a gang of eight citizens of Poland – five men and three women – preyed on the homeless, former convicts and alcoholics in Poland and trickily got them to Britain with false promises of well-paid work.

Moreover, the victims – believed to number more than 400 in the West Midlands – were forced to live in rat-infested houses and work really menial jobs, making about 50 pence or about 63 cents for a day’s work. However, their masters earned some $2.5 million and lived very luxurious lifestyles.

The so-called “masters” – who the police say are members and associates of two crime families, according to the BBC – have since been convicted of slavery, trafficking and money-laundering offenses during two trials.

Reporting restrictions were lifted Friday, allowing details of the harrowing network’s collapse to be published. The accounts of more than 90 victims were heard by jurors, but it is believed that at least 350 more were exploited by the gang.

“This was trafficking and exploitation on a massive scale; this gang treated these people, their fellow countrymen, as commodities purely for their own greed,” West Midlands Police Det. Chief Inspector Nick Dale said in a statement.

“What they did was abhorrent: they subjected victims to a demi-life of misery and poverty. They forced them into work and, if they objected, they were beaten or threatened with violence and told family members back home would be attacked.”