Foreign Minister Sergei Lavrov spoke as Moscow's soldiers smashed Ukrainian defences close to Kharkiv, the country's second largest city.
The attack has forced more than 6,000 Ukrainians to flee their homes to escape the enemy advance.
Lavrov warned that Russia was ready for direct conflict with Western troops if they were sent to defend Ukrainian soil.
He said of the choice facing Nato powers: "It's their right. If they want it to be on the battlefield, it will be on the battlefield."
He spoke after Sweden's Prime Minister Ulf Kristersson said he would host Western nuclear weapons should war break out.
Mr Kristersson said: "Should the very worst happen, the democratic countries in our part of the world must be able to defend themselves.
Destroyer
"Our entire Nato membership and Swedish defence aim is to prevent that situation from occurring.
"If Ukraine had been a member of Nato, they would not have been attacked by Russia."
Western allies were surprised after Vladimir Putin sacked his veteran defence minister Sergei Shoigu and replaced him with deputy prime minister Andrei Belousov.
この記事は Daily Express の May 14, 2024 版に掲載されています。
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この記事は Daily Express の May 14, 2024 版に掲載されています。
7 日間の Magzter GOLD 無料トライアルを開始して、何千もの厳選されたプレミアム ストーリー、9,000 以上の雑誌や新聞にアクセスしてください。
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