While oil markets reacted strongly to the sanctions, analysts said the measures were unlikely to significantly change President Vladimir V. Putin’s war calculations.
After Thursday’s phone call with President Vladimir V. Putin of Russia, President Trump appeared to express doubts about supplying Ukraine with more powerful weapons.
The Russian president warned against fulfilling a Ukrainian request for more powerful long-range missiles, while also suggesting President Trump would decide against the idea.
Dmitri N. Kozak’s departure is one of the few known splinters in President Vladimir V. Putin’s inner circle since the start of his invasion of Ukraine.
It was the second time in less than a week that a Russian drone had flown through a NATO member’s airspace. Last week, NATO scrambled fighter jets to shoot down Russian drones in Polish airspace.