President Trump and European leaders demanded Russian strongman Vladimir Putin agree to a 30-day cease-fire with Ukraine starting Monday, or face “massive” sanctions and bolstered military support for Kyiv. The ultimatum came Saturday out of Kyiv ...

European leaders from Britain, France, Germany and Poland joined Ukrainian President Volodymyr Zelensky in Kyiv in urging Russian President Vladimir Putin to accept a 30-day ceasefire or face more sanctions.

Moscow had discussed reviving the gas pipeline in talks with President Trump on improving economic ties with Washington.

They said that if President Vladimir V. Putin did not agree to the cease-fire, more sanctions would be imposed.

The unilateral ceasefire coincides with the celebrations in Moscow for the 80th anniversary of victory over Nazi Germany in World War II, Russia’s biggest secular holiday. Kyiv has pressed for a longer-term cease-fire.

Ukraine claims Russia has broken its own cease-fire more than 734 times since it took effect Thursday, Ukraine said.