Geopolitical tensions have risen in Europe since the Russia-Ukraine crisis in 2014; in South Asia with the flare-up in Kashmir; and in East Asia with the growing assertiveness of China in its maritime territorial disputes and the continuing series of nuclear tests by North Korea. As a consequence, nuclear risks have also intensified, making President Barack Obama’s 2009 Prague dream of a world freed of nuclear threats an increasingly distant memory. However, great power tensions make nuclear arms control more difficult but also more urgent, and in the closing months of his presidency, Obama has one last chance to resurrect the dream. Continue Reading.