In a shift of tone toward Russia, President Trump last week gave Moscow a 50-day deadline to agree to a cease-fire or face tougher sanctions.

Russia attacked cities across Ukraine with hundreds of drones and a missile strike, hitting energy infrastructure and wounding at least 15 people.

At least 140 flights have been cancelled and Moscow’s major airports were closed after Ukraine launched a drone strike on Russia.The four major airports serving the capital were disrupted and more than 130 flights also had to be redirected,

Moscow continues to intensify its long-range attacks on Ukrainian cities and analysts say the barrages are likely to escalate.