The KGB had instructed him to cease any operational activity and limit himself to paperwork until he was back toin Moscow.

As it seemed, the PET, the Danish Security Service, had been taking too much of an interest in Oleg.

He had been on PET’s radar for too long, hence the KGB was particularly concerned.

Hence the KGB had grown particularly concerned.

The thought of a diplomatic case put Moscow at unease, and this was how the KGB had decided to deal with it for the time being.

So that was how the KGB had decided to deal with it for the time being.

As Oleg digested** the full implications of it allthe implications sunk in for Oleg, he felt a sense of deep unease flooding over him.

At one of thisese partyies, held by a West German diplomat, Oleg fell into conversation with a charming Danish guyman.

One was a Soviet, the other was a Danish, yet they fascinatingly enough, they seemed to have a lot in common.

They shared the same tastes in music, art, literature, and so forth.

Perhaps it was just as well that Oleg had no idea what lay behind that charming, appealing facade, for the Dane was a PET agent inon a mission.

Kind of a long sentence.

The Danish Security Service had laid a trap for Oleg, who had unwittingly avoided it.

**Assuming that the original sentence is correct, can I also say, “As the implications sunk in....”?

Yes

Summary noum.

The KGB had instructed him to cease any operational activity and limit himself to paperwork until he was back toin Moscow.

This sudden change, as the KGB explained, was a damage limitation* movto limit any potential damage.

As iIt seemed, PET, the Danish Security Service, had been taking too much of an interest in Oleg.

The thought of a diplomatic case putmade Moscow at uneasey.

It was customary for diplomats to hold parties and invite colleagues atfrom other embassies.

At one of thisese partyies, held by a West German diplomat, Oleg fell into a conversation with a charming Danish guy.

One was a Soviet, the other was a Danish, and yet they fascinatingly seemed to have a lot in common.

Perhaps it was just as well that Oleg had no idea what lay behind that charming, appealing facade, for the Dane was a PET agent inon a mission.

The Danish Security Service had laid a trap for Oleg, who had, unwittingly, avoided it.

**Assuming that the original sentence is correct, can I also say, “As the implications sunk in....”?

Yes. In fact, "As the implications sunk in" might sound more natural here, at least for me.