His tighter deadline to reach peace with Ukraine and his threat against Russia’s energy customers contrast with a lighter approach to Russia elsewhere.

The Kremlin said on Wednesday it continues to monitor statements by U.S. President Donald Trump regarding sanctions against Moscow, but that Russia had acquired immunity to such measures thanks to long experience.

For months President Donald Trump has been slapping higher tariffs on practically every country’s exports to the United States, citing emergency economic powers.

The U.S. Court of Appeals for the Federal Circuit in Washington, D.C., will consider the legality of "reciprocal" tariffs that Trump imposed on a broad range of U.S. trading partners in April, as well as tariffs imposed in February against China,