this is matthew kalman reporting from the medialine from jericho in the west bank. >>> from africa tonight a follow-up on yesterday's story about strict muslim sharia law in somalia. today it was reported that insurgents had beheaded seven people accused of renouncing islam or for spying for the u.s.-backed transitional government. it was described as the largest mass execution since the islamists were driven from power in somalia 2 1/2 years ago. the rights group amnesty international says the execution sent a broader pattern of torture and unlawful killings by the al shabaab militia. >>> on this week's roundtable discussion, we are going to depart from our usual format and talk about a single topic of thh russia. that relationship evolved this week as the two countries agreed to deeper cuts in their nuclear arsenals. and as president obama met with his russian counterpart dmitry medvedev and with prime minister vladimir putin. we're joined tonight by two russian experts. james hogue. and nina khrushcheva. associate professor at international affairs at the news school here in new york an