The two Russian suspects.

The United States is planning a new set “severe” sanctions on Russia over the alleged attempt by Kremlin agents to kill a turncoat spy in Britain, a State Department official said on Thursday.

Assistant Secretary of State, Manisha Singh, told a congressional hearing that Russia has not yet accepted demands that it come clean about its production of the Novichok nerve agent used in the March 4 attempt to kill former double agent Sergei Skripal and his daughter in Salisbury, England.

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Moscow was given until November to allow on-site inspections of facilities linked to the potent poison and to provide “verifiable” assurances that Novichok will not be used again.

“They have not done so so far,” Singh said.

“We are looking at this November deadline absolutely, we plan to impose a very severe second round of sanctions,” she said.

She said the new sanctions will include banking sanctions, a broader ban on Russian procurement of defense articles, and a block on any foreign aid.

The first sanctions over the Skripal poisoning were implemented in August, halting foreign aid to Russia except for humanitarian assistance and for food and other agricultural products; blocking some defense sales; and banning government credit support for exports to Russia.