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Russell Simmons claims his ex-wife won't let him see his kids ... alleging she's using them as leverage to keep him from taking legal action against her.

Here's the deal ... Kimora Lee Simmons spoke to People last week about her exes ... admitting she doesn't have a relationship with Simmons, actor Djimon Hounsou , or investment banker and convicted felon, Tim Leissner .

KLS told the outlet, "Usually I would say that I co-parent okay, but the kids are with me full-time. I'm pretty much the primary parent. It's difficult, but I don't know sometimes what other people are thinking. Guys are weird."

Well, Russell clearly feels Kimora's not giving the full story on their relationship ... because he took to Instagram to vent his frustration ... first by mentioning he gave h

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