MOSCOW (AP) — Russian President Vladimir Putin on Wednesday directed drills of the country’s strategic nuclear forces that featured practice missile launches, an exercise that came as his planned summit on Ukraine with U.S. President Donald Trump was put on hold.

The Kremlin said that as part of the maneuvers involving all parts of Moscow's nuclear triad, a Yars intercontinental ballistic missile was test-fired from the Plesetsk launch facility in northwestern Russia, and a Sineva ICBM was launched by a submarine in the Barents Sea. The drills also involved Tu-95 strategic bombers firing long-range cruise missiles.

The exercise tested the skills of military command structures, the Kremlin said in a statement.

The chief of the military's General Staff, Gen. Valery Gerasimov, reported to Putin via video link that the drills were intended to simulate “procedures for authorizing the use of nuclear weapons.”

While Putin emphasized that the maneuvers had been planned in advance, they came hours after President Donald Trump said Tuesday his plan for a swift meeting with Putin in Budapest was on hold because he didn’t want it to be a “waste of time.”

The decision about the meeting in Budapest, Hungary, which Trump had announced last week, was made following a call Monday between U.S. Secretary of State Marco Rubio and Russian Foreign Minister Sergey Lavrov.

Lavrov made clear in comments Tuesday that Russia is opposed to an immediate ceasefire in Ukraine. Trump, meanwhile, has been shifting his stance all year on key issues in the conflict, including whether a ceasefire should come before longer-term peace talks, and whether Ukraine could win back land seized by Russia during almost four years of fighting.

Kremlin spokesman Dmitry Peskov on Wednesday emphasized that the planned Putin-Trump summit needs to be thoroughly prepared.

“No one wants to waste time: neither President Trump nor President Putin," Peskov told reporters. "These are the two presidents who are accustomed to working efficiently with high productivity. But effectiveness always requires preparation.”

___

The Associated Press receives support for nuclear security coverage from the Carnegie Corporation of New York and Outrider Foundation. The AP is solely responsible for all content.

___

Additional AP coverage of the nuclear landscape: https://apnews.com/projects/the-new-nuclear-landscape/