Washington’s latest tightening of the economic screws on North Korea has come with a stern warning to those who would help Pyongyang flout sanctions.

Announcing the newest round of American sanctions aimed at Pyongyang, U.S. Treasury Secretary Steve Mnuchin declared that any country that continues to trade with North Korea does so “at their own risk.”

The comments were aimed squarely at Russia: at the beginning of the year, the White House accused Moscow of assisting North Korea in evading sanctions. U.S. President Donald Trump reiterated his allegations just over a month later.

When asked about Russia’s trade with