真金不怕火炼
True gold doesn't fear the test of fire.
今年6月，俄罗斯总统普京接受美国全国广播公司采访时就涉疆、台湾等问题表达了对中方的支持，对企图破坏中俄关系的尝试予以驳斥。对此，赵立坚称：
“真金不怕火炼”。我们也奉劝那些千方百计离间分化中俄关系的人，任何企图破坏中俄关系的图谋都注定不会得逞。
As a Chinese proverb says, "True gold doesn't fear the test of fire." We have to tell those who try every means to drive a wedge between China and Russia that any attempt to undermine China-Russia relations is doomed to fail.
这句习语也可以译作：True gold can stand the test of fire。
另外，“离间”翻译成英语也可以用一个非常形象的表达：drive a wedge between (someone or something) ，形容的是在两个事物中间打入一个楔子，也就是挑拨离间。