There appears to be more to the story:
‘Kislyak was overheard by U.S. spy agencies while he was informing his bosses that he had indeed discussed campaign-related matters with Sessions. That also included issues that were important to Moscow.’
snip
‘Kislyak’s recalled two conversations with Sessions. The former Alabama senator first didn’t disclose his contact with Kislyak during his confirmation hearing. He later claimed that the meetings weren’t about the Trump campaign. However, now it seems they were.’