O que significa created a potential opening for Russian interests at the highest level of a U.S. presidential campaign ?

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There is no evidence in the documents showing that Deripaska received Manafort’s offer or that any briefings took place. And a spokeswoman for Deripaska dismissed the email ex­changes as scheming by “consultants in the notorious ‘beltway bandit’ industry.”
Nonetheless, investigators believe that the exchanges, which reflect Manafort’s willingness to profit from his prominent role alongside Trump, created a potential opening for Russian interests at the highest level of a U.S. presidential campaign, according to people familiar with the probe.