American defense officials raised the security alert level at military bases in Europe in response to vague threats from the Kremlin over Ukraine's use of long-range weapons on Russian territory.
Throughout the war, U.S. officials have assessed that President Vladimir V. Putin is loath to expand the war beyond Ukraine's borders. But stepped-up U.S. and European aid has caused consternation in Moscow.
Ukraine has been using longer-range American missiles known as ATACMS to strike deep into occupied Crimea. The United States has also said Ukraine can use them in cross-border attacks on Russian military targets.
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