The arrivals come as Ukrainian President Volodymyr Zelenskyy said around 280,000 Ukrainian households had been left without power after Russian strikes overnight.
Zelenskyy said on Sunday that Russia has launched roughly 1,600 guided aerial bombs, 48 missiles and nearly 2,300 attack drones against Ukraine over the past week.
Ukrainian authorities say some of the Russian strikes targeted energy infrastructure, days after US President Donald Trump announced an "energy ceasefire".