Вытащил солюшен на уровень выше, чтобы прощё было дотнетить

ApplicationLayer/Services/VisaApplications/Models/Validation/PastVisaModelValidator.cs

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+using ApplicationLayer.InfrastructureServicesInterfaces;
+using Domains;
+using FluentValidation;
+
+namespace ApplicationLayer.Services.VisaApplications.Models.Validation;
+
+public class PastVisaModelValidator : AbstractValidator<PastVisaModel>
+{
+    public PastVisaModelValidator(IDateTimeProvider dateTimeProvider)
+    {
+        RuleFor(v => v.ExpirationDate)
+            .NotEmpty()
+            .WithMessage("Expiration date of past visa can not be empty")
+            .GreaterThan(v => v.IssueDate)
+            .WithMessage("Past visa expiration date can not be earlier than issue date");
+
+        RuleFor(v => v.IssueDate)
+            .NotEmpty()
+            .WithMessage("Issue date of past visa can not be empty")
+            .LessThan(dateTimeProvider.Now())
+            .WithMessage("Issue date of past visa must be in past");
+
+        RuleFor(v => v.Name)
+            .NotEmpty()
+            .WithMessage("Name of past visa can not be empty")
+            .Matches(Constants.EnglishPhraseRegex)
+            .WithMessage("Name of past visa can contain only english letters, digits and special symbols")
+            .MaximumLength(ConfigurationConstraints.VisaNameLength)
+            .WithMessage($"Past visa name length must be less than {ConfigurationConstraints.VisaNameLength}");
+    }
+}

ApplicationLayer/Services/VisaApplications/Models/Validation/PastVisitModelValidator.cs

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+using ApplicationLayer.InfrastructureServicesInterfaces;
+using Domains;
+using FluentValidation;
+
+namespace ApplicationLayer.Services.VisaApplications.Models.Validation;
+
+public class PastVisitModelValidator : AbstractValidator<PastVisitModel>
+{
+    public PastVisitModelValidator(IDateTimeProvider dateTimeProvider)
+    {
+        RuleFor(v => v.StartDate)
+            .NotEmpty()
+            .WithMessage("Start date of past visit can not be empty")
+            .LessThan(v => v.EndDate)
+            .WithMessage("Start date of past visit must be earlier than end date")
+            .LessThan(dateTimeProvider.Now())
+            .WithMessage("Start date of past visit must be in past");
+
+        RuleFor(v => v.EndDate)
+            .NotEmpty()
+            .WithMessage("End date of past visit can not be empty");
+
+        RuleFor(v => v.DestinationCountry)
+            .NotEmpty()
+            .WithMessage("Destination Country of past visit can not be null")
+            .Matches(Constants.EnglishPhraseRegex)
+            .WithMessage("Destination Country of past visit can contain only english letters, digits and special symbols")
+            .MaximumLength(ConfigurationConstraints.CountryNameLength)
+            .WithMessage($"Destination Country of past visit length must be less than {ConfigurationConstraints.CountryNameLength}");
+    }
+}

ApplicationLayer/Services/VisaApplications/Models/Validation/PermissionToDestCountryModelValidator.cs

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+using ApplicationLayer.InfrastructureServicesInterfaces;
+using Domains;
+using FluentValidation;
+
+namespace ApplicationLayer.Services.VisaApplications.Models.Validation;
+
+public class PermissionToDestCountryModelValidator : AbstractValidator<PermissionToDestCountryModel?>
+{
+    public PermissionToDestCountryModelValidator(IDateTimeProvider dateTimeProvider)
+    {
+        RuleFor(p => p!.ExpirationDate)
+            .NotEmpty()
+            .WithMessage("Expiration date of permission to destination Country can not be empty")
+            .GreaterThan(dateTimeProvider.Now())
+            .WithMessage("Permission to destination Country must not be expired");
+
+        RuleFor(p => p!.Issuer)
+            .NotEmpty()
+            .WithMessage("Issuer of permission for destination Country can not be empty")
+            .Matches(Constants.EnglishPhraseRegex)
+            .WithMessage("Issuer of permission for destination Country can contain only english letters, digits and special symbols")
+            .MaximumLength(ConfigurationConstraints.IssuerNameLength)
+            .WithMessage($"Issuer of permission to destination Country length must be less than {ConfigurationConstraints.IssuerNameLength}");
+    }
+}

ApplicationLayer/Services/VisaApplications/Models/Validation/ReentryPermitModelValidator.cs

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+using ApplicationLayer.InfrastructureServicesInterfaces;
+using Domains;
+using FluentValidation;
+
+namespace ApplicationLayer.Services.VisaApplications.Models.Validation;
+
+public class ReentryPermitModelValidator : AbstractValidator<ReentryPermitModel?>
+{
+    public ReentryPermitModelValidator(IDateTimeProvider dateTimeProvider)
+    {
+        RuleFor(p => p!.Number)
+            .NotEmpty()
+            .WithMessage("Re-entry permit number can not be empty")
+            .Matches(Constants.EnglishPhraseRegex)
+            .WithMessage("Re-entry permit number can contain only english letters, digits and special symbols")
+            .MaximumLength(ConfigurationConstraints.ReentryPermitNumberLength)
+            .WithMessage($"Re-entry permit number length must be less than {ConfigurationConstraints.ReentryPermitNumberLength}");
+
+        RuleFor(p => p!.ExpirationDate)
+            .NotEmpty()
+            .WithMessage("Re-entry permit expiration date can not be empty")
+            .GreaterThan(dateTimeProvider.Now())
+            .WithMessage("Re-entry permit must not be expired");
+    }
+}