Looks like the article was updated after the initial posting:

"Manafort's personal business dealings have also come under intense scrutiny in recent weeks, amid damaging questions over his ties to foreign governments and indications that he might have received $12.7 million in undisclosed cash payments. The alleged payments, which Manafort denied, were noted in a ledger kept by former Ukraine president Viktor Yanukovych's political party. Since then, more evidence has surfaced that raised concerns about his ties to pro-Russian politicians in Ukraine."

What that's telling me is that the allegations are being backed up with substance.  What is it telling you?