〜に及んで
when it came to, at the stage of
Verb dictionary form / Noun + に及んで(は)
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に及んで means "when things reached this stage": 警察が来るに及んで、ようやく彼は罪を認めた, "only when the police arrived did he finally confess".
Like に至って, it often introduces a late reaction with ようやく or 初めて. It's also used when a conversation or problem extends to a new area: 話が結婚に及んで、彼は急に黙った, "when the talk turned to marriage, he suddenly went quiet".
The set phrase この期に及んで means "at this late stage" and is always critical: この期に及んで、まだ言い訳をするのか, "you're still making excuses at this late stage?"
及ぶ means "to reach, extend to". Don't confuse it with には及ばない, "there's no need".
Examples
この期に及んで、まだ言い訳をするのか。
You're still making excuses at this late stage?
警察が来るに及んで、ようやく彼は罪を認めた。
Only when the police arrived did he finally confess.
話が結婚に及んで、彼は急に黙った。
When the talk turned to marriage, he suddenly went quiet.
被害が全国に及んで、政府はやっと動いた。
Only when the damage had spread nationwide did the government act.
事ここに及んでは、もう隠しようがない。
Now that it's come to this, there's no way to hide it.