TODAY: Medvedev pushes for cooperation in Afghanistan, Pakistan and Tajikistan.  Lavrov says no justification for Ukrainian expulsions; mortars rumble in South Ossetia as anniversary tensions brew; Russia puts the no in NATO.  Journalist denied entry to Lithuania. No smokes for soldiers.In his meeting with leaders of Afghanistan, Pakistan and Tajikistan President Medvedev spoke of their 'common space', 'which should be filled with all sorts of projects' emphasizing energy, trade and transport.  Will today's CSTO summit be hindered by differences?  In the capital of South Ossetia two loud explosions have been reported, serving an an early reminder of the imminent anniversary of last year's 5 day war.  South Ossetia apparently intends to demand the ...