She said this when answering the question of what measures the United States can take in the long term to prevent the appearance on the black market of weapons and military equipment supplied to Ukraine.

“We continue to work with our Ukrainian colleagues and we believe in their assurances.

They ensure arms control properly, ”TASS quoted her as saying.

Lewis added that the United States is also working with countries neighboring Ukraine to ensure that their authorities "understand when weapons should not cross borders."

Earlier, the Financial Times reported on the plans of the EU and NATO to tighten control over the transfer of weapons to Ukraine due to fears that they will fall on the black market.