WASHINGTON, April 2 (Aljazeera) - US Secretary of State Antony Blinken has urged the release of Wall Street Journal reporter Evan Gershkovich in a call on Sunday with Russian Foreign Minister Sergey Lavrov.

Russia’s Federal Security Service (FSB) said on Thursday that it had arrested Gershkovich, accusing him of gathering information about a Russian defence company that was a state secret.

The Wall Street Journal has denied Gershkovich was spying. The White House has called the espionage charge, which carries a jail term of up to 20 years, “ridiculous”.

“Secretary Blinken conveyed the United States’ grave concern over Russia’s unacceptable detention of a US citizen journalist. The Secretary called for his immediate release,” the US Department of State said in a statement that did not mention Gershkovich by name.

A US official, speaking on condition of anonymity to Reuters news agency, said the statement did refer to Gershkovich.

Under US law, the State Department is generally barred from speaking about a US citizen unless he or she has signed a privacy waiver.

Russia’s foreign ministry said Lavrov told Blinken it was unacceptable for Washington to politicise the case, adding that Gershkovich’s fate would be determined by a court. He reiterated Russia’s assertion, for which it has not presented any evidence, that the journalist was “caught red-handed” last week.

“Blinken’s attention was drawn to the need to respect the decisions of the Russian authorities, taken in accordance with the law and international obligations of the Russian Federation,” the Russian foreign ministry said.

“It was emphasised that it is unacceptable for officials in Washington and the Western media to whip up a stir with the clear intention of giving this case a political colouring,” the ministry added, saying Blinken initiated the conversation.

Direct conversations between Blinken and Lavrov have been rare since Russia’s February 24, 2022 invasion of Ukraine.

The two spoke face to face for the first time since the invasion on the sidelines of a wider March 2 meeting in New Delhi.