LONDON • When the Trump administration announced early last year the United States' decision to withdraw from a significant nuclear arms control treaty with Russia, politicians and commentators around the world rushed to condemn the move as a blow to international security.

But when the same Trump administration announced last week its withdrawal from another international treaty designed to allow for the mutual verification of the military equipment and deployments of armed forces throughout the European continent and North America, reactions were muted, and most world leaders just shrugged their shoulders.