ATHENS — Russia’s foreign minister has reportedly canceled a trip to Greece, as tensions escalated between the two countries over a decision by Athens to expel two diplomats accused of trying to stoke opposition to an agreement that would clear the way for Macedonia to join NATO.

The dispute over Macedonia’s name was of little interest outside the region, but it has become wrapped up in more prominent conflicts, especially after President Trump’s weeklong tour of Europe: Concern about the Kremlin’s suspected attempts to manipulate Western politics, Mr. Trump’s contradictory statements about both Russian meddling and his commitment to NATO, and Moscow’s opposition to any broadening of the Western alliance.

The strains between Athens and Moscow deepened after Macedonia agreed in June to change its name to North Macedonia following negotiations with officials in Greece and on July 11 was invited to join NATO, pending final approval of the agreement.

Greek officials said last week that Athens told Moscow on July 6 that it would expel two diplomats, and bar two other Russian citizens from entering the country, because of “irrefutable evidence” that Russia was trying to meddle in the Macedonia deal.