Visa and MasterCard said they can no longer support their payment cards being used in Crimea.
The move by the world’s biggest payment card companies follows the latest round of US sanctions imposed earlier this month over Russia’s annexation of the peninsula in March.
The United States has prohibited US-registered companies from investing in Crimea or providing services to firms operating there.
Many cardholders have experienced declined transactions in shops and at cash machines.
Meanwhile trains between Ukraine and Crimea are being suspended because of unspecified “security concerns”.
Ukraine’s state rail company said cargo services have already stopped. Passenger services will gradually cease between now and Monday.
“In order to ensure the safety of passengers … [the railway] will cut the route of trains to Crimea off at Novooleksiyvka and Kherson,” it said in a statement, referring to two towns on the Ukrainian mainland near Crimea.
Power outages began in Crimea
Defendant in "Hizb ut-Tahrir" case missed birth of daughter
Chubarov: Mogilev fled from Crimea, when we fought for it
IS Militants shot nearly 300 people in Mosul
Merkel predicts sanctions against RF for actions in Syria
ATO Headquarters: Militants used Grads in Luhansk direction
Egypt resold "Mistrals" to Russia for $ 1
Russia refused to release Kolchenko and Sentsov to Ukraine
Dzhemilev and TİKA opened the Crimean Tatar cultural center
RF Cabinet of Ministers ‘snips’ Black Sea
Court considered case of Mejlis member Zeynur Yakubov in Cr
Putin's sinister image
Road map plan to ensure security in Donbas
Prosecutor of ATO forces charged with illicit enrichment
Crimea-SOS announces rally in support of kidnapped in Crimea
Scary and amazing, leading to the world of the unconscious: exhibition of masks
Italy hinders introduction of new sanctions against Russia
Incidence of tuberculosis in Crimea is higher than in Russia
Umerov received 2 examination results from FSB
Putin feared to see NATO ships in Sevastopol
Russia refused to return control of Debaltsevo to Ukraine
Ships of Russian Navy are heading to Scotland
Collection of unique documents on Crimea presented in Kiev
Anti-terrorist exercises launched in Krasnogvardeiskoe
Sanctions against RF for annexation of Crimea may increase