Russian officials persisted in saying Ukraine and the West had a role in last week’s deadly Moscow concert hall attack despite vehement denials of involvement by Kyiv and a claim of responsibility by an affiliate of the Islamic State group. Without offering any evidence, Alexander Bortnikov, head of the Federal Security Service, or FSB, followed similar allegations by President Vladimir Putin, linked the attack to Ukraine even as he acknowledged that the suspects arrested were “radical Islamists.” The IS affiliate claimed it carried out the attack, and US intelligence said it had information c…