Deepening Russia-North Korea ties test US-South Korea deterrence strategy 

washington — The United States’ commitment to providing extended deterrence to South Korea is being put to the test, with some South Korean politicians publicly questioning the effectiveness of the U.S. nuclear umbrella after Russia and North Korea reached a new defense pact. Debate over the U.S. extended deterrence was sparked by Representative Na Kyung Won, a five-term lawmaker of South Korea’s ruling People Power Party, who is running for the party leadership. “The deterrence under the solid...