Britain has slapped sanctions on Belarus to pile pressure on President Alexander Lukashenko over human rights abuses of political opponents and journalists.
The Belarusian regime took power a year ago in an election which critics said was rigged, leading to tens of thousands of people protesting on the streets of Minsk.
Lukashenko, who is backed by Moscow, responded with a brutal crackdown on his critics in which many have been arrested or gone into exile abroad.
The UK has now banned Belarusian potash and petroleum exports from Belarus, as well as restricting financial transactions by its government and state-owned banks.
The measures also prevent their aircraft from flying over or landing in the UK and any technical assistance being given to the President's fleet of luxury planes.
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So far Western sanctions have done little to persuade Lukashenko, in power in the former Soviet republic since 1994, to change course from his crackdown on political opponents.
But Foreign Secretary Dominic Raab said: "These sanctions demonstrate that the UK will not accept Lukashenko's actions since the fraudulent election.
"The Lukashenko regime continues to crush democracy and violate human rights in Belarus.
"The products of Lukashenko's state-owned industries will not be sold in the UK, and our aerospace companies will not touch his fleet of luxury aircraft."
However, the Belarusian President said Britain should "choke" on the sanctions, adding: "You are America's lapdogs".
EU sanctions designed to punish Lukashenko for the crackdown will leave him largely unscathed and able to continue financing the economy and his security forces, analysts say.
Meanwhile, Polish authorities reported that a record number of migrants have crossed the Polish border with Belarus since Friday.
Poland and Lithuania, which have seen a surge in illegal migration in recent weeks, have accused Lukashenko of using migrants to put pressure on the EU to reverse sanctions.
Warsaw also believes it is way of hitting back at Poland for giving refuge to Krystsina Tsimanouskaya, a Belarusian athlete who refused to return home from the Tokyo Olympics.
