Colleagues of Ms. Estemirova say her murder Wednesday is part of a pattern that shows cost of a Kremlin pact with Chechnyan President Ramzan Kadyrov.
Natalia Estemirova, who has long documented abuses by government-backed militias, is the fourth prominent critic of Kremlin policies to be killed in three years.
Ten percent of the 40 crashes by Russian-built Tupolev Tu-154s have been in Iran. But Russian experts say its a reliable jet.
The head of the Missile Defense Agency suggests the plans could be altered, echoing President Obama's desire to compromise with Russia.
The EU and Turkey signed a $11 billion gas pipeline deal that should give Europe more supply options.
Congressional Twitterers include Sen. John McCain, who last year said he didn't know how to use e-mail. But don't look for tweets from President Obama.
But the issues they raised are longstanding, going back to China's "strike hard" policy against the mainly Muslim minority – a policy that was strengthened by US cooperation following 9/11.
US backs Costa Rica's Arias to mediate the crisis, wary of being seen as interfering in the region – as it has in the past.