With a Friday deadline for Russia to agree to peace in Ukraine or have its oil customers face secondary tariffs, Trump has found a novel, but risky, use for his favorite trade tool.

Swiss President Karin Keller-Sutter flew to Washington on Tuesday to seek talks with the Trump administration over the steep 39% tariff imposed on Switzerland. But Keller-Sutter was only able to meet with Secretary of State Marco Rubio, not with any of the primary tariff negotiators.

President Donald Trump said he will “substantially” raise tariffs on India because it’s still buying Russian oil.