The new Cold War is in the swimming pool at Rio

While Russian TV analysts are taking shots at Michael Phelps over his "cupping" therapy, there's another Russia vs America feud brewing in the pool at Rio, bringing the countries to the brink of a new Cold War.

It all started with the Russian doping scandal and the decision to allow some Russian athletes to still compete in the Rio Olympics, a decision that didn't sit well with other Olympians (though Russia's entire Paralympic Games squad has been banned).

Caught up in the controversy is Russian swimmer Yulia Efimova, who was reinstated for the Olympics after originally being banned. On Sunday night, Efimova took to the pool for the preliminary heats for the women's 100-meter breaststroke only to be met with boos from the audience.

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But that wasn't the only brewing feud for Efimova. American swimmer Lilly King, also swimming in the 100-meter breaststroke, was watching Efimova's heat while awaiting her own and gave the Russian swimmer a Dikembe Mutombo finger wag when Efimova appeared on a monitor.

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It gets better.

After Efimova posted the top time for her semifinal heat and held up an index finger for "number one," which prompted King's finger wag, King went out and, in the other semifinal heat, beat Efimova's time by one one-hundredth of a second.

And then, in a post-swim interview, King poured on some more salt, saying of Efimova, "You're shaking your finger number one, you've been caught for drug cheating, and I'm just not a fan."

Here's the best part: It will all be settled in the pool. King has the top time and Efimova the second-fastest time heading into Monday night's final (9:54 p.m. ET), meaning they'll be swimming side-by-side in the middle two lanes, all for the gold.

Don't expect much of a post-race hug between the two once the splash settles.