When the government sets a maximum price for a specific good or service, that's a price ceiling.

政府为某一特定商品或服务设定的最高价格就是价格上限。

And so it insisted on introducing a weakening clause: provided they agree to pay a maximum price, set by the G7, for Russia's oil, non-Western buyers could continue to buy European insurance.

因此它坚持引入弱化条款：只要他们同意为俄罗斯的石油支付 G7 设定的最高价格，非西方买家就可以继续购买欧洲保险。