Michael Flynn, President Donald Trump's former national security adviser, failed to disclose payments from a Russian television network and a second firm linked to Russia in a February financial disclosure form, according to documents released by the White House on Saturday.

In a financial disclosure form signed by Flynn on March 31, the former White House official listed speaking engagements to Russian entities, including the Kremlin-funded RT TV and Volga-Dnepr Airlines.

The form does not say how much Flynn was paid but the speeches are in a section titled "sources of compensation exceeding $5,000 in a year."