Well Russia has far more expirience in ABM construction than you may think .. even more than US as it has during the cold war designed about 7-8 ABM systems and now has only in the world operational ... On fas blog I read some disclosured CIA documants about Russian ABM .. they said that Russia has capability to design credible ABM shield in 5-10 max years... so ???
First missile (smallest range) of S-500 system with the range of 500km (unknow any other data) has begin testing by the 2007 end .. so I have no doubt.
The reason why S-400 took to long to introduce is that originaly S-400 was not suposed to be what is now. Russians where suprised by US theather ABM development THAAD so they decided to incorporate S-1000 system in the S-400 meaning specs where increased to matched and surpass THAAD in celing, speed, bla bla .. few times this practice has occured each time delaying intorduction of S-400 system for witch other missiles like 9M96/9M9E/9M96E2 and 48N6DM where finished by 2003 and some even sooner.
First missile (smallest range) of S-500 system with the range of 500km (unknow any other data) has begin testing by the 2007 end .. so I have no doubt.
The reason why S-400 took to long to introduce is that originaly S-400 was not suposed to be what is now. Russians where suprised by US theather ABM development THAAD so they decided to incorporate S-1000 system in the S-400 meaning specs where increased to matched and surpass THAAD in celing, speed, bla bla .. few times this practice has occured each time delaying intorduction of S-400 system for witch other missiles like 9M96/9M9E/9M96E2 and 48N6DM where finished by 2003 and some even sooner.