The Washington Post article explicitly states
For almost anyone in government, discussing such matters with an adversary would be illegal. As president, Trump has broad authority to declassify government secrets, making it unlikely that his disclosures broke the law.
So yes, WaPo is perfectly up-front that the President’s staggering breach of protocol, precedent, and common sense may not have technically constituted a breach of the law. That doesn’t mean it’s not an impeachable offense though. If nothing else this demonstrates a staggering lack of judgement which could quite likely sever intelligence operations with our allies and even get field agents killed.
