U.S. Puts First Sanctions on North Korean Leader Kim Jong Un

WASHINGTON—The U.S. for the first time imposed sanctions on North Korean leader Kim Jong Un as part of what U.S. officials said is an escalating campaign to attack his regime’s finances in retaliation for its nuclear-weapon and ballistic-missile tests.

The Obama administration also blacklisted 10 other senior North Korea officials Wednesday for allegedly aiding Mr. Kim in running a nationwide system of prison camps, torture chambers...