UPDATE 1730 GMT: Because of cancelled flights, I have been delayed in return from Austria. EA's LiveBlogs will be back on Tuesday morning about 0500 GMT. Thanks to readers for their patience.
I am returning from the Salzburg Global Seminar, where I have been working with scholars and postgraduate students on "Continuity and Change in US Presidential Foreign Policy: Plans, Policies and Doctrines".
Updates to LiveBlogs will resume this afternoon. Meanwhile, I thank readers in advance for keeping us ticking over with latest news and ideas.