NEW: The US believes Russian President Vladimir Putin has decided to invade Ukraine, and has communicated that decision to the Russian military, three Western and defense officials tell me.

The US expects the invasion to begin next week, six US and Western officials tell me, as Secretary of State Antony @SecBlinken said last night.

US officials anticipate a horrific, bloody campaign that begins with two days or aerial bombardment and electronic warfare, followed by an invasion, with the possible goal of regime change.