俄航洲际航空破产，下周二飞北京-莫斯科-巴黎

第一段un8888正常北京-莫斯科，第二段un0555取消 莫斯科-巴黎
不知道是否是联程，如何查看？
收到取消邮件：
In spite of all our efforts we regret to inform you that the only possible option provided by the airline is a refund. Please kindly note that refunds are at the discretion of the airline and although normally based on a roundtrip ticket/return ticket, it is possible that the airline only provides a refund for the cancelled flight. If this is something you would like to verify, please let us know when you request the refund.
我是否需要提前买好莫斯科-巴黎的机票呢？还是到那里等他们的交涉？