BASKING RIDGE, N.J. — President Donald Trump said Saturday he believes the Russia-Ukraine war would end if all NATO countries stopped buying oil from Russia and placed tariffs on China of 50% to 100% for its purchases of Russian petroleum.

Meanwhile, Polish and allied aircraft were deployed in a “preventive” operation in Poland's airspace because of a threat of drone strikes in neighboring areas of Ukraine, and the airport in the eastern Polish city of Lublin was closed, authorities said. The alert lasted about two hours.

It came after multiple Russian drones crossed into Poland on Wednesday , prompting NATO to send fighter jets to shoot them down and underlining long-held concerns about the expansion of Russia’s more than three-year war in Ukraine.

Trump played down the severity of

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