Russia is observing a national day of mourning today after a fire at a nightclub in Perm killed 112 people.  President Dmitry Medvedev demanded that Russia tighten ‘notoriously lax fire codes‘, although it is also being reported that the club’s owners had been fined twice before for breaking fire safety regulations, and four of them have now been arrested.  The Strategic Arms Reduction Treaty, or START, expired over the weekend, with no replacement treaty having been agreed on. Both sides insist that they will continue ‘in the spirit of the treaty‘ and that there are no security risks.  ‘But the expiration deals a blow to those in the Obama administration who hoped to achieve at least this one tangible step before the president receives the [Nobel Peace Prize].‘  The Times is pessimistic: ‘We can’t assume that Russia and the US will manage to sign a new version of the Start arms reduction treaty.‘  On Dmitry Medvedev’s draft treaty for global security.