The US and European delegations on the UN Security Council have condemned Belarus's behavior in the migrant crisis on its border with Poland.
Poland has said the government of strongman Alexander Lukashenko has lured about 2,000 migrants to Belarus for the purpose of sending them across the border in revenge for sanctions.
The Western delegations at the Security Council issued a joint statement condemning "the orchestrated instrumentalisation of human beings whose lives and wellbeing have been put in danger for political purposes by Belarus."
Meanwhile, Belarus leader Alexander Lukashenko has vowed to respond to any new sanctions imposed over the migrant crisis on his country's border with Poland, including by potentially cutting off the transit of natural gas to Europe.
"If they impose additional sanctions on us... we must respond," Mr Lukashenko said in comments to officials in Minsk released by the presidency.
"We are warming Europe, and they are threatening us," he said, pointing out that Russia's Yamal-Europe gas pipeline transits through Belarus to Poland.
"And what if we halt natural gas supplies?"
Pressure is building to address the plight of hundreds of migrants, mainly Kurds from the Middle East, who are stuck at the Belarus-Poland border in freezing weather.
The West accuses Mr Lukashenko of luring the migrants to Belarus to send them across the border, in revenge for sanctions imposed last year after a heavy crackdown on the opposition.
EU officials say they expect to approve new sanctions over the migrant crisis next week.
Poland has deployed 15,000 troops along the border, put up a fence topped with barbed wire and approved construction of a wall on the frontier with Belarus.
In a statement released for Poland's Independence Day today, Prime Minister Mateusz Morawiecki said his country was facing a "new kind of war" whose "ammunition is civilians".
Poland accuses Belarus of using intimidation to force migrants to breach the frontier and refusing to allow them to leave border areas.
Belarus has in turn accused Poland of violating international norms by blocking the migrants and violently beating them back.
Migrants have been trying to cross the border for months but the crisis came to a head when hundreds made a concerted effort on Monday and were pushed back by Polish border guards.
They set up a camp on the border, sheltering in tents and burning wood from local forests to keep warm, blocked by Polish guards behind razor-wire. Belarus says some 2,000 people are living at the camp.
Teams from the UN refugee agency, the International Organization for Migration and the Red Cross visited the camp today to check on conditions and deliver aid, including hygiene kits and nappies.
"Priorities now are to prevent loss of life and move people to safer locations in Belarus," UNHCR chief Filippo Grandi said on Twitter.
Lithuanian Foreign Minister Gabrielius Landsbergis told reporters his country was pushing for an evacuation corridor from the border to the Belarusian city of Grodno, which has an airport that could be used to send people back to their home countries.
The migrants have been making sporadic attempts to cross, with Polish border guards reporting 468 attempts overnight yesterday.
At least ten migrants have died on the border, seven of them on the Polish side, according to Polish newspaper Gazeta Wyborcza.
Journalists and charity workers have been banned from the immediate border area by Polish authorities under state of emergency rules.
Fear in Polish town
Residents in the Polish town of Sokolka near the border said they were worried by the growing tension but voiced support for the Polish government's tough stance.
"I'm afraid of the migrants getting through and what the consequences would be," said Henryk Lenkiewicz, a 67-year-old pensioner walking by a community noticeboard in the town centre.
European leaders have been putting pressure on Mr Lukashenko's main backer, Russian President Vladimir Putin.
German Chancellor Angela Merkel telephoned Mr Putin yesterday to ask him "to use his influence" to stop what she called an "inhumane" instrumentalisation of migrants.
Poland has accused Mr Putin of masterminding the crisis, a claim the Kremlin has dismissed as "irresponsible".
France's Europe Minister Clement Beaune said there was no evidence that Russia was involved in trafficking migrants, adding it should be "part of the solution because Belarus is more and more dependent on Moscow".
Russia and Belarus have close economic, political and military ties and Russian air force planes have been flying patrols over Belarus this week, including two Tu-160 strategic bombers today that were accompanied by Belarusian Su-30S fighter jets.
'Ireland stands with Poland, Lithuania and Latvia'
The Minister of State with responsibility for EU Affairs has said he is appalled by the escalation of events orchestrated by Alexander Lukashenko at the external border of the European Union.
Thomas Byrne said Mr Lukashenko's "cynical exploitation of migrants for political purposes should cease."
In a statement he said "Ireland stands with Poland, Lithuania and Latvia in resisting Lukashenko's attempts to provoke a violent confrontation on our external borders.
"We need to see a peaceful resolution to the current crisis, and we call on the Belarussian regime to stop playing with people’s lives.
"International aid workers and experts must be allowed to assist migrants trapped on the border. Belarus must also allow people to return to Minsk and subsequently travel back to countries of origin.
"They should not be holding them hostage, with armed security cutting off their way back."
Minister Byrne said that "Ireland is supporting and co-sponsoring a fifth package of sanctions against individuals and entities complicit in Lukashenko’s weaponisation of migration and his violations of human rights."
He added that he hoped the new measures will be introduced in the coming days.