In the first article (link here), the Journal revealed that Mueller is investigating possibly unlawful activity involving the Trump administration in its dealings with the United Arab Emirates (UAE), a federation of seven Emirati monarchies on the Saudi peninsula. The UAE has been heavily lobbying the Trump White House to take its side in a regional dispute against Qatar.
Trump has been oddly effusive about the UAE in public comments and has gone out of his way to disparage Qatar, notwithstanding the latter had always been a strong American ally and also the location of a critical important American military base. Numerous media outlets have reported in recent months that the White House turned against Qater after the country's sovereign fund declined to finance business projects of Jared Kushner, Trump's son-in-law. Various news reports have stated Kushner directly solicited the Qatar loans from inside the West Wing.
While the Journal report notes that the exact nature of Mueller's UAE inquiry is not known at this time. The piece nonetheless reveals that Mueller is leaving no stone unturned in his investigation.
The second article (link here) details how Mueller is investigating whether longtime Trump confidante Roger Stone acted as a cutout between the Trump campaign and Wikileaks, which in turn may have been a cutout between Stone and the Kremlin.
Mueller is widely believed to be investigating whether the Trump campaign -- and Trump himself -- coordinated in any way with the Kremlin or other Russian entities to release hacked emails from the Democratic National Committee and the Clinton campaign. Any such coordination potentially could be prosecuted as felonies.
Reading articles like this, one comes away with the sense that we in the public only have a tiny glimpse of what lies beneath the surface of the Mueller investigation. It's like an iceberg, where most of the mass and all of the danger lies beneath the surface.
And that iceberg may be on a collision course with the President, his family, and his associates.