It's impossible to keep up with all of these but...

Forbes with an overview of what's at stake in Crimea, both symbolically and in terms of realpolitik, after Russia took control of Crimea (with shots fired but no casualties so far); LRB with a history of Russia's interference in the sovereignty of other states, Foreign Affairs and the New Yorker on Putin's strategy, the New York Times about the Cold War, sort-of, resurfacing, Politico on Russia's relationship with the West ("Russia sees an America vulnerable: in Afghanistan, in Syria and on Iran—a United States that desperately needs Russian support to continue shipping its supplies, host any peace conference or enforce its sanctions."), and bookforum with a collection of more links about the Crimea crisis (and for perspective on the sanctions - Russia in the European energy sector, and for potential, here's what's happened to the Russian economy since the crisis started.)