Several thousand protesters stormed the regional administration building in Luhansk Tuesday after a group of youths broke windows with metal bars and let the crowd in.The rebels replaced the Ukrainian flag with a Russian one, while riot police stood by.In the capital, Kyiv, acting president Oleksander Turchynov lashed out at the country's law enforcement for failing to act."The overwhelming majority of law enforcement bodies in the east are incapable of fulfilling their duties to defend our citizens.New heads of the Security Service of Ukraine have already been appointed in Donetsk and Luhansk.The leadership of the special forces "Alpha" has been totally replaced," said Turchynov.Ukraine and its allies have accused Russia of fueling the crisis in eastern Ukraine to clear the way for another incursion into the region after annexing the Crimean peninsula.NATO member nations bordering Russia have asked the alliance for additional protection.Deputy Supreme Allied Commander in Europe Adrian Bradshaw visited Latvia Tuesday to discuss measures to strengthen NATO's presence in the Baltic region."Our judgment is that the actions that we've taken at the moment are proportional and appropriate to the changed security dynamic that we face.It gives a very clear indication on NATO commitment to the region,but the things we are doing could not be considered threatening to anybody outside the region," said Bradshaw.NATO already has increased its air policing and naval presence in the Baltics.