From Secretary of State John Kerry‘s reply to a question about Russia’s actions in Ukraine on the CBS news show “Face the Nation,” March 2:

Well, it’s an incredible act of aggression. It is really a stunning willful choice by president Putin to invade another country. Russia is in violation of the sovereignty of Ukraine. Russia is in violation of its international obligations. Russia is in violation of its obligations under the U.N. charter, under the Helsinki Final Act. Its violation of its obligations under the 1994 Budapest agreement. You just don’t in the 21st century behave in 19th-century fashion by invading another country on completely trumped up pretext.

So it is a very serious moment, but it is serious not in the context . . . of Russia-U.S. It is serious in terms of sort of the modern manner with which nations are going to resolve problems.