Olga Balashova / AP

Russia's defense ministry said Monday that it will treat U.S.-led coalition planes west of the Euphrates in Syria as targets after the U.S. downed a Syrian jet over the weekend, bringing an end to the agreement between the U.S. and Moscow, reports FT.

The no-fly zone demanded by Russia: Key cities like Aleppo and Damascus would be out of bounds for coalition aircraft. Most Kurdish and ISIS territory would not. (Go deeper with this map by Axios' Lazaro Gamio.)

Why it matters: The incident is the first time the U.S.-led coalition has shot down a Syrian plane since the beginning of the country's civil war six years ago. Moscow denounced the action as a violation of international law and has reportedly suspended its incident-prevention hotline with the U.S. in Syria in retaliation, per AFP.

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Illustration: Sarah Grillo/Axios

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Arrest over letter to Trump containing poison ricin

President Trump returning to the White House from Minnesota on Sept. 18. Photo: Win McNamee/Getty Images

A suspect was arrested for allegedly "sending a suspicious letter" after law enforcement agents intercepted an envelope addressed to President Trump containing the poison ricin, the FBI confirmed in an emailed statement to Axios Sunday.

Details: The suspect, a woman, was arrested while trying to enter New York from Canada, law enforcement forces said.

Trump campaign goes all in on Pennsylvania

Trump poster in Scranton, Pennsylvania. Photo: Robert Nickelsberg/Getty Images

The president's campaign is placing more importance on Pennsylvania amid growing concern that his chances of clinching Wisconsin are slipping, Trump campaign sources tell Axios.

Driving the news: Pennsylvania, which has 20 electoral votes, twice Wisconsin's number, actually has been trending higher in recent public and internal polling, a welcome development for the campaign.