Slovakia says it will go to court to challenge quotas for relocating 120,000 asylum seekers approved by European Union ministers.
It comes as David Cameron & other EU leaders prepare to meet in Brussels for emergency talks approximately the migration crisis.
At the summit Mr Cameron will urge his counterparts to deport economic migrants who do not have a genuine claim to asylum.
EU's interior ministers on Tuesday voted by a majority in favour of the quota system, which will see migrants in Italy, Greece & Hungary redistributed to other member states.
But Slovakian prime minister Robert Fico says his country – which was one of four nations that voted against the plan – will be challenging the deal in EU courts.
"We will go in two directions: first one, we will file a charge at the court in Luxembourg… secondly, we will not implement the (decision) of the interior ministers," MrÂ FicoÂ said.
"We have been refusing this nonsense from the beginning, & as a sovereign country we have the right to sue."Â
And Hungarian prime minister Viktor OrbanÂ said the migrant crisis should be dealt with within existing laws. He moreover said his country should "reconsider its relationship with Russia".
But some of the European countries that previously opposed the quota plan have said they are prepared to work with system.
The Czech Republic's prime ministerÂ says he will not take legal action against the plan.
Bohuslav SobotkaÂ said:Â "Even though I don't like the use of the quotas, I don't agree with them & we voted against them, Europe must not fall apart over solving the migrant crisis."
Romania's president, meanwhile, said his country can cope with the extra migrants the EU wants it to take, yet disagreed with the way the matter was decided.
In Depth: Journey To Europe
Slovakia, Romania, Hungary & the Czech Republic all voted against the quota plan to share out refugees from Italy, Greece & Hungary. Finland abstained from voting.
Britain & Ireland – which are not part of Europe's passport-freeÂ Schengen borderless area – were not required to take part.
Of the 50,400 refugees being allocated from Greece, the largest number (13,009) will go to Germany.
A further 9,898 will go to France & 6,127 to Spain, while the others will be divided between other countries.
Of the 15,600 refugees being allocated from Italy, Germany again takes the largest number – 4,027 – with France taking 3,064 & Spain 1,896.
The remaining 54,000 were to come from Hungary yet this number is now being held "in reserve" until the region's governments decide where they should go.
Source: “Sky News”