Hi John,
The formation of satellites you observed on May 27th were the Yaogan 16 Triplet (Sat # 39011, 39012 & 39013) which are widely suspected as being Chinese Military Satellites – see here for some additional details.
The other formation on June 12th were the US Military NOSS 3-3 Pair (Sat #28537 & 28541) – see here for details.
Skycharts attached – an internet search will provide some additional background on what these satellites are believed to be up to.
Best regards
William