PARIS (Reuters) - France’s foreign minister on Tuesday expressed his solidarity with Britain after a nerve agent attack on two Russian nationals, including a former spy, calling it “totally unacceptable.”

“The attempted assassination of two Russian nationals on March 4 in Salisbury with the use of a military-grade nerve agent is a totally unacceptable attack,” France’s foreign ministry spokeswoman Agnes Von der Muhll said in a statement.

The statement followed a telephone call between Foreign Minister Jean-Yves Le Drian and his British counterpart Boris Johnson. The statement made no mention of Russia, which Prime Minister Theresa May on Monday said was “highly likely” to be behind the attack.