Readers discuss staying involved during difficult times. Also: Supreme Court ethics; South Korea’s example; too much feedback; new friendships.

American agencies have assessed that China dislikes the growing partnership between Russia and North Korea. The State Department has raised the troop issue with Chinese diplomats.

At a meeting of emerging economies, Vladimir Putin positioned himself as a respected and powerful leader, ignoring the condemnation he receives from the West.

North Korea’s decision to dispatch troops to help Russia subdue Ukraine may put another Kremlin ally, China, in a tough spot diplomatically.