U.S. warns Russia not to intervene in Ukraine

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(CNN) — U.S. Secretary of State John Kerry warned his Russian counterpart, Sergey Lavrov, on Saturday that “Russia should not intervene in Ukraine under the guise of humanitarian convoys or any other pretext of ‘peacekeeping,'” according to a senior State Department official.

Kerry urged “all parties to work through international organizations” to provide humanitarian assistance in eastern Ukraine, the official said.

In a separate call Saturday, U.S. Vice President Joe Biden and Ukrainian President Petro Poroshenko agreed that any Russian action in Ukraine, even for purported “humanitarian” purposes, without the formal, express consent and authorization of the Ukraine government would be “unacceptable and a violation of international law,” according to the White House.

Russia has denied allegations that it is supporting separatists in Ukraine and maintains it wants to see a diplomatic solution to the ongoing crisis there. But U.S. and Ukrainian officials have accused Russia of saying one thing while doing another: increasing troop levels along the border and continuing to send support to pro-Russian separatists.