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Expelled Russian diplomats have left their embassy in Washington to fly home.
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President Barack Obama, a Democrat, expelled Russian diplomats in retaliation in December.
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More than 20 countries have expelled Russian envoys in solidarity with the UK.
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More than 20 countries are expelling Russian envoys in solidarity with the UK.
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The United States and governments across Europe are expelling Russian diplomats en masse in response.
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May, welcoming the show of solidarity, said 18 countries had announced plans to expel Russian officials.
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Twenty-six countries have expelled Russian envoys in the past two days, in solidarity with the UK.
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Mr Lavrov said the same approach will be applied to other nations that expelled Russian diplomats this week.
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Lithuanian president Dalia Grybauskaite said she would consider expelling Russian diplomats accused of working as spies in Lithuania.
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It comes after the government was mocked for failing to follow the country's traditional allies in expelling Russian spies.
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The Guardian's headline reads: "New Zealand says it would expel Russian spies... but it can't find any".
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British Prime Minister Theresa May, welcoming the show of solidarity, said 18 countries had announced plans to expel Russian officials.
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Nato expels Russian diplomats Nato is expelling seven Russian diplomats in response to the nerve agent attack in the UK.
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Lithuanian President Dalia Grybauskaite said she was ready to expel Russian spies and diplomats said Poland could do so too.
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Relations between Russia and the West hit a new low, and the US was among UK allies that expelled Russian diplomats.
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Why did the government insist there were no Russian spies here and buck the trend of its allies, who expelled Russian diplomats?