Russian Foreign Minister Sergei Lavrov says the United States put "colossal pressure" on its allies to expel scores of Russian diplomats. 24 countries announced on Monday they were expelling more than 130 Russian diplomats, in a show of solidarity over the alleged nerve agent attack on a former Russian spy and his daughter in the English city of Salisbury. Lavrov says his country will retaliate. The British cabinet met on Tuesday to discuss the issue. NATO chief Jens Stoltenberg says the military alliance is set to unveil measures in response to the alleged nerve agent attack.