Russia resumed mass drone attacks in Ukraine early on Sunday, after its self-declared three-day pause expired.

Three-day ceasefire in Ukraine that was unilaterally declared by Russian President Vladimir Putin last month was set to come into effect at 5 p.m. ET on Wednesday (midnight Moscow time), as Russia prepares to mark the anniversary of its World War II Victory Day on Friday.

Ukrainian President Volodymyr Zelenskyy on Sunday challenged Russia’s President Vladimir Putin to meet him personally in Turkey on Thursday, the latest move in a weekend-long exchange of proposals from both sides on the next steps in the U.

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

Latvia's intelligence service has warned of a potential Russian attack on NATO as the US-led military alliance continues to monitor a major build-up of Kremlin forces as the Ukrainian war rages on

The weapon is made with a model aircraft engine available for approximately $16,000, according to the Ukrainian Main Intelligence Directorate.