The caller posed as former Ukrainian Foreign Affairs Minister Dmytro Kuleba, according to a notice warning Senate offices to be cautious about similar attempts.
Proposals had been made to change Russia's nuclear doctrine to allow for attacking any non-nuclear state that had the participation or support of a nuclear state, Putin said.
The U.S. military uses the munition for smoke screens and to light up battlefields. Rights advocates object to its use near civilians because the chemical burns human skin.
“We are going to follow the developments, the deliberations, and reach a final decision accordingly,” the Turkish president said in an exclusive interview.
Kyiv has launched devastating blows on Russian arms facilities in the past week, demonstrating far-reaching potency as it pushes allies for the ability to strike even deeper into Russia.
Russia has a long history of spying on the U.S. from the relative safety of Mexico City, dating back to the 1980s. Decades before that, Stalin had his chief rival assassinated there.
Russia quickly sought to weaponize the suspect's support for Ukraine, an unwelcome development for Kyiv as both U.S. support and the fight on the battlefield appear to hang in the balance.